Here are a couple sculpts I've made over the past couple weeks in Blender. Even though it lacks the thorough tool set of programs like Zbrush, Blender has very capable sculpting tools. The thing I like best about it is that it's a complete 3d package, so you can model and sculpt at the same time, in many ways making up for the lack of a few key tools. Anyway, the first one is a bit more complete, about 2 hours. The second head took about 45 minutes. Fun stuff.