My new interest.....ZBrush Quick Sketch

I just got Zbrush 3.5R3 and I really enjoy the new release. I especially enjoy the quick access of the "Quick Sketch".....which rapidly become my new hobby....paint!! here are some stuff i did....i start off with 5 mins quick sketches....quite difficult to get somewhere with that amount of times T_T.....then after i did around 6~7 sketches, I started to refine the shape and adding detail to the sketch.The refine part i try to keep it around 20 mins or so......Let me know what you think...