You nailed the hair...thats something people often struggle with but I do have one ounce of advice. When you do a perspective drawing like this and something like a hand or a card or an object of any kind is "presented" sort of for the viewer, you want to put extra detail on that. You have the contours of the hand down perfect but if you added the creases or some lines to so detail in the hand itself it wouldn't look like rubber. It's real subtle but I'm talking specifically about the pointer and middle finger on the hand. Coloring looks well done. You were very careful doing this. Looks great!