It's been another all-nighter.
Nice linework, and the start you have on the colors looks good.
Her hands could use a little work, even if this is just a sketch. On the one hand her index finger looks about fifty years older than the rest, not to mention only half a thumb. On the nearest hand, her index finger is misproportionately large.
The face looks unique. Faces come in a great variety of shapes and structures, so it's hard to definitively say what needs improving. She would look more feminine with a smaller chin, or simply one that doesn't jut out so far. Maybe her mouth area is too small? Also, maybe if you moved that highlight on her cheek up, it would make her cheekbone higher and give her that certain look.
If you want to make the coloring very interesting, don't use the same skin tones throughout the body. For example, the area around the mouth and chin might be a little blueish, the nose and cheeks more reddish, and the forehead slightly yellow. Make her chest, belly, shoulders and possibly upper arms a paler color, and her forearms more dark. Her hands could be darker yet, with a redder color. Also, skin reflects into itself a brilliant orange sort of color in the right lighting conditions, so use where necessary.
There's some reasoning to this; the skin is usually thinner and less exposed to the sun in those aforementioned areas, hence its having a tendency to be pale, whilst the forearms would be tanned and the extremities of the body sometimes just happen to be red. Besides that, though, it sure makes it much more visually appealing. Of course, everything has to be subtle or its effect will be lost and will probably bite you on the ass if it's too pronounced.
But I like what I see, and it is most certainly a solid foundation. Keep at it, and I'm interested to see what you come up with. | 
