/ic/ - Artwork/Critique

Any advice on improving?
What books and courses should I pick up?

Some of the drawings on the right are from early in the year.
I improved at the start of the year but not near the end.

I've read perspective made easy, design and invention, figure drawing for all it's worth, anatomy for sculptors and color and light.

Some people have told me to work on rendering and feeling the form but I'm not sure how to improve on that.

Any other advice for improving would very much be appreciated like books and videos.

Right now I'm stuck and don't know how to improve.
I'm working on my perspective and also trying to think in 3D.