Anatomy, perspective and backgrounds! O and I guess color/effects some too... Mostly Anatomy though! Animal/creature needs the most work but humans aren't quite right either... (pffft I just wanna improve everything ><)
Split between background and color. I also want to work on composition, focusing on how drawings are framed and where the eye leads. That combined with well placed color and lighting would make compelling art pieces.
I may have forgotten some stuff so uh, comment if what you want to improve on is not there XD "Anatomy" is the same as "human" or "animal/creatures", depends on what anatomy you want to improve on the most