I am not an artist, but the one thing I remember from art class is that everything is just lines. Like instead of drawing an eye, because that is an abstract concept and we have a pre-concieved notion of what an eye should look like, or for example a heart like this <3, when in reality they look nothing like that, and our mental abstraction of it makes it harder to draw it as it really is.

That, and to have a growth mindset. I would spend a lot of time working on the assignments then not care when I finished and it looked like shit because I was practicing the concepts and growing even though I had no idea if I was getting any better, but after the class, looking back through I could tell. I wasn't particularly into it.

I get what you are going through though, I am in the same sort of rut with my music, but I always remember this when I am feeling shitty: "The Greats weren't great because at birth they could paint. The Greats were great because they paint a lot."

So stick to it! Take your time. The more you do it, the better you will get. And rhetorical question: are you doing this for likes, or are you doing it for yourself and to become a better artist?