I've been drawing for 22 years, and while my understanding of anatomy, perspective, etc. is constantly improving, the one thing I can't seem to improve is the quality of my pencil lines. I really need advice on how I can improve. I see other people's sketchbooks and their lines, even when sketched out fast, are fluid and bold. But no matter how precise I try to be, my lines always have this shaky, sketchy, broken look to them, like this:
When I want them to look like this:
I know the typical anwers are always 'practice more' or 'just erase and go over them', but I can't escape that scratchy look and it frustrates me to the point where I don't even want to draw anymore sometimes.
Can anyone give me some advice?