Bellsprout is a truly unique-looking Pokémon! Its bulbous body is mostly bright yellow, with a light green ring around its neck. Its bell-shaped head has two small leaves on top, a large mouth and bright red eyes. I'd recommend coloring its body a bright baby-yellow, then darkening the green ring around its neck for some contrast. To bring that bell-shaped head to life, try using some light green and white to add texture to the leaves and shading on the inside of its mouth. Squint your eyes and it might even look as if it has a smile! For its eyes, I'd go with a bright, bold scarlet color to really make them stand out. If you want something a bit more whimsical, try blending yellow and pink together for a pastel-y look.