I'm not a great draftsperson...I may not even be that GOOD. But through time, experience and practice I have definitely become a BETTER draftsperson.
I have drawn all my life but my skills were generally unstructured and self-taught in my youth. I attended art school briefly and came to the realization I didn't need to spend a lot of (my parents') money to learn how to become a "starving artist."
Somehow or other (but that's another story) I ended up in the animation business drawing pictures for a living for 13 years at major studios like Disney and DreamWorks. While there I was surrounded by master works of art and the masters who created them. Along the way I learned some interesting tips that might be of use to artists hoping to "plus" their own work.