More practice with the warm cool balance. The other area I'm trying to improve in is luminous transparent darks. The idea is to use transparent thin layers of color in the shadows to create a dark yet glowing area.
I've noticed along with the skills I'm developing, patience with the process is also required. When I first started painting I tried to blast through my paintings with the idea that the faster I painted the more m0ney I made if it sold. Now it has become much more important to take the time to create work that I am proud of.