Personally, good dance poses are always welcome. But...what SHOULD you be working on?  Well, you should be working on whatever projects you like. You'll learn faster if it's something you want to be doing instead of something you think of as an assignment. And there is nothing in 3D you can't pick-up as you go along, and learn more things as you go along...it doesn't end: There always something new to be learned. And, BTW, that is half the fun of 3D. You can read up on lighting anytime, you can always look for tutorials on doing post-work (you'll probably want a layer-oriented art program for both additional art - things like touching up hair and compositing). There are both cheap and expensive graphics programs out there. If you have one of those, there a billion tutorials to be found online.