Terrific.
There are two possible answers to your question.
1. Find a more suitable hand from another shot, and put it in there. This could be easy, or insanely hard, depending on what hands you can find.
2. Google "Puppet Warp Tutorial". It's designed for exactly this purpose. However, it'll be a bit of a learning curve, so allow lots of time. (In fact, before you even start, ask yourself if it's worth all the time it will take. How important is this to you?
If you go for Option 2, make sure you do it on a duplicate of the background layer, because you'll need to clone out the original hand. Read this article to see what I mean. The cloning will need to be very careful, because it will be painfully obvious if you don't line up the fabric texture properly.