For many years now, I've taken life (i.e., there's a live model) drawing and painting classes.
Taking classes is a good way to spend a chunk of time drawing and painting in the company of other people who care about art. I'm not Picasso in Paris; I don't have a café where I can hang out with other artists and then wander back to their studios to look at their work. Classes fill some of that social need for me.
Although my finished paintings have been mostly still lives (so far), I always enjoy drawing the figure. It's an endless challenge. It is both extremely complex and extremely familiar, so that if any detail is even slightly off, you'll know immediately. This is in contrast to a subject like a tree, which might be just as complex, but less familiar, so that if the branch structure is slightly off, no-one's the wiser. If you can draw the human figure, you can draw anything.
Above is my latest effort from life-drawing class. It's pretty well developed for me, since it was one three-hour session. One skill I'm working on is the ability to paint quickly and directly, with minimal fussing and second-guessing.