It’s completely normal for colours to look unusual or “off” while you’re still painting. When viewed on their own, individual colours can appear too bright, too dark, or different from what you expect. However, paint by numbers relies on how colours interact with one another.
Our eyes perceive colour based on contrast and surrounding shades, a principle known as colour interaction. Once neighbouring areas are painted, the colours visually balance and harmonize, creating depth, shading, and a more realistic image. This means the painting often looks most accurate only once multiple sections, or the entire design, are completed.
Paint by numbers is very much a trust-the-process activity. As the artwork comes together, the colours work collectively to recreate the image, and the final result will look far closer to the reference image than it does during the early stages.