Welcome from N California!
Posting a picture sounds good, so others can get an idea of what is going on.
Even though I've never done it before, I'd like to suggest that you do a sample of the painted leaves to see what they would look like. Also, bear in mind that the leaves could very well look more different than you think once you do quilting on it. Maybe use a different color thread to suggest the veins or whatever they're called.