Finding a Natural Green
When painting your own plants, it can sometimes be difficult finding the right color of green. I use several methods for selecting colors. One is to use the mixer palette in Painter. The palette shown below exhibits a whole array of great natural greens, and I never used green in the mix. Most of the greens were established by mixing black and yellow. Then around the edges, I mixed in some cyan and blue. To get some red for flowers, I then mixed in a little red and orange. The additive colors were all chosen from the basic colors shown at the top of the mixer.
Here is a bush I painted in Photoshop using only the colors from the mixer palette. As you can see, I will often place some background colors behind the plant as I paint just to see how it will display against various background colors in the final painting.
The final test is placing it in a few renderings to see if it blends well. If needed, I will make some highlight /shadow adjustments to finish of the plant before placing it in my library.