Here's a great few pages about improving the figures in your drawings. I have no idea what book this comes from -- if anyone does know, please comment. I'd like to read more by this author.
I know, it looks like a lot to read and you're busy today. But at least glance through the remarks beside the examples for Stage 1 and Stage 2. I've never heard the term "twinning" before, but I'm guilty of it.
Bringing Drawings to Life