If you want to get better at drawing something (like drawing hands) take some time to fill up pages with whatever it is you need to practice. Do it over and over for a while. Even if it’s just for a week or so.
Hands are as important for expressing emotion and action as the face. I’m guilty as anyone for not exploring just how much “acting” can go on with the hands. But when you look at an artist who nails it, you never forget it.
Keep on working!1