I cant break out of rough sketching because sketching is hard. Goes over lines over and over and over gets annoying and really i don't have the patience to do it, but i have to get into the habit of doing it anyway. It normally takes me two hours to make a sketch out of a rough sketch.
that's me. i started sketching when i started reading the Gaston Lagaffe comics, and i practiced sketching those characters; i've been sketching ever since. it's much more efficient than drawing lines like you're inking and erasing them every minute. i can just sloppily sketch an image and clean it up once i'm done.