I usually use basic Vallejo model/game colors, I can't recall the exact combinations, but here's an approximate breakdown: for the bulb: Intermediate Green (70.891) - you can add a touch of yellow to get the base color, for highlights, you can add more yellow, and for shadows, blend in a darker green for the body: a mix of blue fluorescent (70.736) and intermediate green. You can experiment by adding small amounts of white, yellow, or even red to fine-tune the tone to match bulbasaur's coloring (if you do not have the fluorescent blue, you can use any blue and get the right tone by adding white/green/yellow to it)