There are a lot of variables for me. Sometimes I draw really freaking well, I could draw a garbage heap and it would look FANTASTIC, and other times I can't even draw a chibi. It's sad.
Sometimes I go into a drawing expecting it to come out like crap, and it does the exact opposite. I end up doing wayyyyyyy too much. Infact, the Guild Wars Wintersday Entry:

I wanted that image originally to look like watercolor and to be literally, just two quick ANIME sketches. That isn't even close to anime, and it was no where near to quick, that sucker took me 2 weeks!
I always seem to do more than I actually want. That's not always good, if anything it's BAD because it makes me go into overtime and then I get lazy and just stop working on it.