There is an awful lot to learn in these "little" 6x6 paintings: Color mixing (and matching), brush work, shapes, strokes, shadows, proportion, composition, etc.! Good grief. For how little the paintings looked like the reference set-up, I was surprised that the colors matched at all. I guess with a small painting, the errors are proportionately BIGGER.
I bought a sunflower for a fresh start.
Even with so few colors, the variations and brush strokes seemed impossible to get "right." Now I understand why so many people say you have to do 500 bad paintings to get a good one.