You just have to keep on drawing complete junk, again and again and again... It's horrible when everyone else that you know is already good at art! It would totally kill what little motivation I could conjure up. XD
Something else I picked up on - if you sit there, drawing disgustingly-misproportioned pictures repeatedly, (making the same mistakes and not learning from them), then you'll progress like... 50-times slower. You gotta show people, ask them to critique or redline sections of your work, etc.
I've had such a hard time trying to improve that i've started compiling certain reference pics, and each step that I've taken 0where I noticed instant improvement.
Also, we don't know how good you are - you said "practice" not "learn" so i'm assuming you already have some skill at drawing?
