I have often run into a problem when I brush geometry with sides too close together. The brush can collapse your two-sided geometry into itself. To fix this problem you can go to down to a low subdivision and then use the move tool to pull the object's sides apart again, then continue to go up in subdivisions pulling the sides apart. Alternatively I find the Inflate brush makes solving this problem quite easy.
At this point I'm mostly finished with the hair sculpt. I threw on some quick base colors for show. Next up: poly-painting.



I also made this fellow (MONSTRO!) while messing with zspheres and this painting while messing with quick sketch.





