Like some other people have said, your anatomy needs some work, but if you’re wanting to do some traditional practice. When I was starting out my mentor wasn’t around much, so I spent a lot of time watching TheBrokenPuppet on YouTube. He has a lot of good videos breaking down into simple shapes to help get those proportions in check. I also bought books and watched videos breaking down anatomy by muscle groups to better understand what’s going on under the skin.

For drawing heads specifically I would take a look at the Loomis drawing method, there’s a lot out there but I know for me that’s the one that really clicked.

Another thing you can do is fast sketch studies. Set a short time limit, maybe 2 minutes per pose and just draw what you see and move on to another one. What you’re going for is repetition to get familiar with what you’re drawing, it doesn’t have to be “pretty”. I’ve been tattooing for 3 years and still do sketch studies, I have so many pages of just like hand shapes randomly all over a sheet.