It took me a while to make this simple tutorial of how to make figurine hand. Wish I have an extra hand to take pictures... It is pretty much self explain of step by step in the picture comparison. Although it looks simple but you do need the proportional conception of human's hand and fingers in mind. And also compare with the character that you are making. Make a good calculation for the size, think it over through, get it right at once.
Please note the nail should better be made from the beginning of each finger. You might not get a good position to sculpt the nails when putting fingers together. Only if you are making large size hands.
The picture shown with a shape knife meant when you going to bend the fingers. Make a shape cut but don't cut it off! Pull it up a little, bend it and fix a bit for the gaps after you bend it.
I make it in small scale so you may use the same skill to make larger hands. Hope this may help you a little. Please advise if you have any suggestion or question. Thank you for watching my friends! Enjoy!!