Well she was the first i worked on afterall, so there are some obvious issues like the hair you pointed out... The hands sure need work, but i'm not able to make them very detailed, they're really small on the paper i use...
Mind, the drawings actual size is just A6, i can not draw out certain things very detailed (or in any case, i'm forced to sharpen the pencil really often, hahaha)...
I'd probably need bigger paper like A4, but i'm too lazy to go with that, A6 is much easier to get done with, even if it's not as pretty... Takes less time, too, i hate using much time on drawings...
I only ever drew like this when i have drawn Duke Nukem drawings in the past... It's a new experience with girls though, hahaha...
[edit:]
I just slightly updated both of those two girls now, but i'm not happy with the middle part of Roppon's hair, looks so plain, and i'm too lazy to go fix it again... Blargh...