Here's a bit of a composite--a graphite sketch transferred to watercolor paper with my vinca green mix. I first used the Quin Orange mix but had difficulty getting dark enough so back to Cad Orange I went. Deep, rich green then came easily.
Most veining is a result of razor knife scratching. Also experimented with lifting to simulate highlights.
It's rough but I'm having fun seeing the pieces come together. I suppose I'll be in this iterative loop of improving sketches and coloring. I'll bet the flowers would really kick against these greens!