Fish. I love fish but I never can seem to draw fish with personality. Their shape leaves a lot to be desired as far as being able to coax something expressive from them. Whenever I've tried to draw them in the past it always falls flat. Drawing things that are devoid of personality is not fun for me and I always do better when I can inject some life into something.
So I tried more fish today... They range from "Eh" to "Eh, ok, I guess." on my scale of success.