Practice Drawing, you get more out of it than you think.
Practicing art doesn’t mean you have to invade your personal art time. You can spend most of your art day drawing what YOU want to draw, but at least once in a while take a half hour or more of that time and dedicate it to learning. I would encourage taking more time than that if you really want to improve, but a half hour is a good place to start.
Find some photos of hands and feet, or draw your own. Draw them ten times in different positions. Do this with arms, faces, eyes, muscles, trees, everything! If you don’t feel like you’re learning anything while you do it, don’t fret. Most of us get that feeling. Staying encouraged to draw can be difficult if you don’t realize other people feel this way too. You’re not teaching yourself how to draw it outright, you can’t do that in one lesson.
What you’re doing is pocketing some of that information for later. Think of your brain as an empty box. You’ve got to put things in it before you can take anything out. When you practice like this, you’re filling up your box. Not in big pieces, it’s always little ones! But those little pieces add up.