Ok both these drawings show a lot of potential :D good work, and I hope you keep it up.
I prefer the second one. The angle makes it seem really intense. The shape of the car looks to be sketched out well, and you've got a good sense of proportion. I would really like the second drawing to be finished if you ever found the time.
The details in you're first drawings are excellent though, i'm a bit of a detail fanatic though, so the more small parts the better :P
The anatomy of the woman in the first picture doesn't have any glaring problems. This is great because 1) anatomy is hard to get right, and 2) bad anatomy can ruin an otherwise great picture.
I really hope you get round to finishing one or both of these, or even start something entirely.