I wanted to share a small tip to use subtraction of a cube to try to create sharp edge. I used this to create a simple hair. (also its helpful to use dynamesh to reduce number of polygons before using qremesher.. just need to reduce number of polygons in dynamesh calculation).
Here's an example shown on my original model and character design i'm sculpting.
(to subtract out a shape use the insert brush but then hold alt before drawing)
Inspired by Michael Defeo's online modeling demonstrations at Defeo