This coloring page features a white onion with a subtle purple hue, cut in half and with its peel partially removed, lying on a cutting board. Beside the onion is a sharp knife which was used to half it. Coloring the onion white would be a good starting point, then you could use a purple or lilac shade to give it a hint of color. You could also make the knife silver or gray to create contrast between the two objects. Additionally, adding shadows and highlights among the cuts and folds of the onion's peel can make it look even more realistic. Finally, you can bring out the cutting board itself by adding a light tan, brown, or wooden hue to it. Enjoy coloring!