Hey Sabrina, Nice job doing all these hands, practicing them will serve you well. Make sure that even when you stylize hands, that you still work to make them look like they have volume and dimension. Also, by using some details like folds in the skin or fingernails can help us show perspective. I did a couple of sketches to show you what I mean. Cartooning, or stylization is very subjective, but I think this will help your hands look more dimensional. Hope it helps :)