Have you ever run into a wall while sculpting in ZBrush? I would suggest doing some quick speed sculpts. In a speed sculpt you spend around 20 to 60 min working on one quick sculpt. You don't worry about how it looks, you just quickly put something down and make bold and decisive moves. I find that doing speed sculpts like these helps me warm up and overcome my inner critic. Its nice to just get into the flow of things and not be worrying about what the model is going to look like.
Today I tried doing a few speed sculpts. I'm currently working on a realistic human and to help me get in the groove I spent about 30 min to a hour sculpting out some quick body parts.
