I tried to put a yellow flower on a cream background. Even with the inked outline, I wasn't sure which petals were pencilled. Though I've only tried gouache once before, I decided that it would help to have a dark green gouache background. It really didn't help with the fact that putting yellow on cream doesn't work for me. Maybe daylight instead of incandescent light would have helped. Ah well, I won't try that again. Meanwhile, the petals on the flower closed before I could finish!