The Numbering System: What Do the Numbers Mean?

Understanding brush sizes is a bit like shoe sizing—it varies depending on the manufacturer and the specific brush family (like sable vs. bristle). The number typically refers to the width of the ferrule (the metal band connecting the bristles to the handle) or the diameter of the brush head.

Generally, the scale breaks down into four broad categories:

  • Very Small (#20/0 to #2): Best for fine detail work, tiny illustrations, and miniatures. The sizes with slashes (like #20/0) indicate fractions—the larger the denominator, the smaller the brush.
  • Small to Medium (#3 to #6): Perfect for general detailing, controlled brushstrokes, and smaller areas.
  • Medium to Large (#7 to #12): Your workhorse brushes. Great for blending, adding depth, and mid-sized coverage.
  • Very Large (#14 to #24+): Designed for bold strokes, extensive washes, and large background areas on large canvases.

Beyond Numbers: Brush Shapes and Their Uses

While sizing is important, the shape of the brush dictates the marks it leaves on the canvas. A size 12 round brush will behave very differently than a size 12 flat brush.

  • Round Brushes: Incredibly versatile; perfect for fine lines, detailing, and filling in areas. When pulled to a fine point, they act like a pencil.
  • Flat Brushes: Square-ended with medium to long hairs. Excellent for broad washes, crisp, straight lines, and geometric blocking.
  • Filbert Brushes: Features a flat body with a rounded, oval tip. It acts as a hybrid between a round and flat brush, making it the ultimate tool for soft, natural blending and organic forms.
  • Fan Brushes: Shaped like a hand fan, this brush is used for blending, smoothing, and feathering, as well as painting natural textures like clouds, hair, or foliage.

Pro-Tip: Don’t Be Afraid of the “Big” Brush!

Many beginner artists fall into the trap of using brushes that are too small. Using tiny brushes for the majority of a painting can cause you to get lost in needless details and miss the overall composition. Try using the largest brush you feel comfortable with for the foundational stages of your painting, as it helps you make bold, meaningful strokes and saves you a ton of time.

A Quick Note on Handles

Brush handle length also impacts your workflow:

  • Short Handles: Best for watercolors, gouache, and close-up detail work where you need the control of holding a pencil.
  • Long Handles: Ideal for oil and acrylic painting on larger canvases. They allow you to stand back at arm’s length, encouraging looser, more gestural arm movements.

Traditional Art: Stretched Canvas

If you work with oils, acrylics, or watercolors, dimensions matter not just for your composition, but for framing and storage. Here are the most popular industry sizes:

  • Small & Studies (8 × 10 inches): Excellent for quick painting studies, miniatures, or gifting.
  • The Sweet Spot (16 × 20 inches): The most popular canvas size. It is highly versatile—large enough to display a detailed landscape or portrait, yet simple to frame or mount on almost any wall space.
  • Large Statement Pieces (24 × 36 inches & up): Ideal for commanding attention in a living room or gallery space.

Pro-Tip: Remember that canvases are typically listed in Height × Width. A landscape (horizontal) is 20 × 16, while a portrait (vertical) uses 16 × 20.

💻 Digital Art & Blog Graphics

Creating visual content for your website, social media, or blog requires precise dimensions. Incorrectly sized images can cause slow page loading or get cropped awkwardly on mobile platforms.

  • Blog Featured Images: The industry standard is 1200 × 628 pixels. This 3:2 ratio nestles perfectly into most website layouts and serves as a highly clickable thumbnail when shared on platforms like Facebook.
  • Portrait/Vertical Blog Images: If you rely on Pinterest to drive traffic, 900 × 1200 pixels is the ideal size.
  • Instagram Squares: 1080 × 1080 pixels.
  • Social Media Banners: 1640 × 856 pixels.

Pro-Tip: If you are using a tool like Canva, you don’t need to memorize the pixel dimensions for every platform. You can use the built-in presets or the Magic Resize tool to instantly format your images.

⚖️ A Note on Aspect Ratios

An aspect ratio defines the relationship between the width and the height of your canvas. Keeping this in mind helps you scale your work:

  • 4:5 Ratio: Common for physical art and a favorite for social media (8 × 10, 16 × 20, 24 × 30).
  • 2:3 Ratio: Excellent for sweeping, wide-angle photography or panoramic paintings (12 × 18, 16 × 24, 24 × 36).
  • Square (1:1 Ratio): Perfect for modern branding and Instagram grids.

Why Use Putty On Canvas?

Traditional canvas paintings rely purely on color and brushstrokes to create depth. However, adding a thick, moldable medium like drywall spackle, joint compound, or sculpting putty introduces true physical dimension. It allows you to create sweeping waves, geometric ridges, or heavy, impasto-style valleys that catch the light and add dramatic contrast to your décor.

What You’ll Need

You can gather everything you need for under $30:

  • The Base: An old, thrifted art canvas or a fresh, budget-friendly one.
  • The Texture: A tub of ready-mixed drywall spackle, joint compound, or wall putty.
  • The Tools: A standard putty knife and palette knives (or even old credit cards!) to spread and shape the “mud.”
  • The Color (Optional): Acrylic paints if you want to mix color directly into the putty or paint over the finished, dried texture.
  • Sealer: A spray fixative to lock everything in place once it cures.

4 Steps to Create Textured Art

  1. Prepare the Canvas: Tape off the edges of your canvas with painter’s tape to ensure the putty doesn’t cake heavily around the sides.
  2. Apply the Putty: Plop the putty onto your canvas and use your putty knife to spread it out. You can keep it relatively flat as a base or build it up into thick, expressive waves.
  3. Shape and Dry: Work quickly before the putty dries to create unique patterns and ridges with your knives. Leave it to dry completely, which can take anywhere from 24 to 48 hours depending on how thick you applied it.
  4. Sand and Paint: Once dry, lightly sand any razor-sharp or overly rough edges. You can leave the piece as a striking, minimalist white, or paint over the entire thing with a base coat and subtle color washes.

Pro-Tips for Success

  • Avoid Cracking: If you apply the putty too thickly in one layer, it may crack as it dries. If this happens, simply fill the cracks with a little more putty and let it set.
  • Mixed Media: For even more creative options, you can experiment with water-soluble graphite putty or mix a tiny bit of PVA glue into your wall putty for extra elasticity.
  • Find Inspiration: Check out décor blogs or browse popular DIY textured canvas ideas to find a color palette or sculpting style that matches your room’s aesthetic.