>>3724550You will need to figure out what is actually holding back your line quality first.
It's usually either the medium you're using, your motor skill, or your understanding of the subject matter you're drawing
If you can draw lines well on one medium, yet you can't on another, it might be the medium that's holding you back. This is not to imply that the medium is bad, though. More likely is that you're simply not used to it. Do some research on the medium you're having trouble with or seek some advice from your peers just to make sure you're not doing something horrendously wrong. Other than that, it's simply a lot of practice.
If you still can't draw even a basic line or shape cleanly and confidently regardless of medium, that means it's your motor skill that's holding you back.
Thankfully, that can be easily rectified with exercises like Dynamic Sketching. Do it for a few weeks and you should notice immediate improvement.
But if you can already do that kind of stuff, yet your line quality drastically goes to shit when you draw more complex subjects (figure, face, architecture, etc.), that means it's your understanding of the subject matter that is holding you back.
This is obviously a much more complex problem and there isn't a one-size-fits-all solution for it. Rigorous studies, research and practice of the subject matter would be the only way through this.
