Here are a few practice sketches I've done. Some of these are a few years old already. It's always a good idea to keep practicing still life and human anatomy, specially those dynamic poses so you don't get that stiff awkward look.
If you want to practice your dynamic pose sketching skills I recommend visiting www.posemaniacs.com. They have this app where it randomly shows the human figure in different poses for 30 secs. Its a great way to practice and a useful source of reference too.