I guess the question that comes along is...
What in the hell is wrong with your hand man? It looks like you are a 50 year old obese man just by the drawing of your hand. XD
Anyway, the details in the wrinkles were rather well. I just don't see this being a realistic hand for some reason, but if you say it's your hand then I guess it's your hand.
The pointer finger looks like it's bending at a crazy angle. Personally my finger isn't that flexible and when I try to copy the movement it gets much deeper. So either your finger itself is very flexible and bends in ways it shouldn't or you should add more depth and make the inside of the knuckle look like it's a little bit father away.
Again with the thumb as well. You either have a double jointed thumb that points in an odd direction or you just didn't get the angle right. If your thumb bends that way then alright, but if not then it seems like it's way too curved to be attached to a hand.
I guess what I would have really liked to see in a picture like this would be something to fill in the dead space of white. Something like your hand being on a surface such as a table or even just a shadow of your hand. Maybe even a little bit of something in the background as well just because the white space makes it a little bland.
I wouldn't mind seeing a hand from the other view because I thought you did a good job on the detail in the thumb and wouldn't mind seeing what the finger nails would have looked like on the other fingers as well.