Artist mixing custom acrylic colours on a palette next to a paint by numbers canvas.

Customizing Your Canvas: How to Change Colours and Add Details

Summary

Once you understand the basics of acrylic painting, the numbers on your canvas become suggestions rather than strict rules. Learn how to confidently change colours, alter backgrounds, and add custom silhouettes to make any paint by numbers kit uniquely yours.

Every paint by numbers kit is designed to guide you toward a specific, guaranteed result. But what if you want to paint a landscape, only you wish the sky was a sunset pink instead of a midday blue? Or what if you want to add your own dog to the foreground of a quiet forest scene?

If you have been practicing the methods from our advanced blending guide and our impasto texture tutorial, you already have the brush skills required to take creative control. It is time to treat the printed lines as a foundation, not a cage.

Customization Type How to Execute It Best Used For
Colour Swapping Mixing your own acrylics or swapping pots to change the primary colour of a specific object. Changing a red dress to a blue dress, or matching artwork to your living room decor.
Background Replacement Ignoring the background numbers completely and painting a solid colour or a smooth gradient. Making the central subject pop out, or simplifying a busy, cluttered background.
Adding Details Painting freehand shapes or silhouettes over the top of the completed and dried canvas. Adding personal elements like a family pet, birds in the sky, or custom text.

Artist mixing custom acrylic colours on a palette next to a paint by numbers canvas.

Figure 1: Mixing your own colours gives you total creative freedom over the final artwork.

Colour Theory for Swapping

Changing colours requires a basic understanding of colour theory so your painting does not look unbalanced. If you want to change a major element, look at a colour wheel.

If you want the new object to stand out dramatically, choose a complementary colour. For example, if the background of the painting is mostly warm orange, painting a central object in a cool, deep blue will make it pop perfectly. If you want the object to blend in naturally, choose analogous colours, which are colours that sit next to each other on the wheel, like green and yellow. If you are ordering a custom paint by numbers canvas, you can even request colour adjustments before the kit is printed.

Pro Tip: Hiding the Printed Numbers

If you swap a dark colour for a very light colour, the printed number on the canvas might show through the paint. Before applying your new light colour, dab a tiny amount of white paint or white correction fluid over the number and let it dry. This acts as a blank slate.

Simplifying the Background

Sometimes a kit has a background that feels too busy for your taste. You have full permission to ignore those background numbers. Many advanced painters choose to paint the entire background a solid, bold colour to make the main subject look more modern and striking.

Alternatively, you can use the wet on wet technique to paint a smooth gradient from top to bottom, ignoring all the tiny, complex shapes printed in the background area. This is a highly effective way to save time and create a gallery style finish.

Colour wheel diagram showing complementary and analogous colours for paint by numbers customization.

Figure 2: Understanding complementary colours will help you swap paints without ruining the visual balance.

Adding Freehand Silhouettes

The easiest way to personalise a generic landscape is to add a silhouette once the painting is completely dry. Because silhouettes are typically solid black or dark grey, you do not need to worry about complex shading.

Wait until your entire canvas is finished and dry. Then, use a fine detail brush and black acrylic paint to add the outline of a bird in the sky, a person sitting on a bench, or a cat in the window. If you want to paint a highly detailed, full colour version of your own animal, it is best to start from scratch with a dedicated custom pet paint by numbers kit where the shading is calculated for you.

A completed paint by numbers landscape with a custom painted silhouette added in the foreground.

Figure 3: Adding simple silhouettes over a dried canvas is a great way to personalize a generic scene.

Save Your Original Paints

If you decide to mix your own custom colours, do not use the original paint pots provided in your kit for the mixing process. Always mix custom colours on a separate palette. This ensures you still have the original, unmixed colours available in case you make a mistake and need to paint over an area.

Want total creative control?

Do not settle for generic artwork. Upload your own photo and let us turn it into a premium paint by numbers project.

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William Murdock founder of Paint On Numbers UK

About the Author: William Murdock

Founder of Paint on Numbers UK. William is dedicated to providing high quality kits and educational resources to help hobbyists of all levels create artwork they are proud to display.

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