@B++: I don't mind at all.
With the eyes included, the polycount is 511872. Also, the eyes are in a separate model (I just added a simple sphere that I mirrored and subdivided once). Which program are you using? It might be worthwhile to check out the link to the tutorials I put in the OP. Although they use Blender, and demonstrate the creation of a rather grotesque zombie head, I was able to adapt the general sculpting practices to heads of any kind.
@Mazz: Er.. I think Blender's plenty equipped for sculpting, as I have just demonstrated as a sculpting noob. The mesh I'm working on now is a quite high resolution, and could go even higher, when I need it to. And to provide even finer detail, I can just retopologize the mesh (currently it's only a flat grid) so that the underlying topology actually compliments the surface features. While the tools Blender has currently aren't quite as attractive as the "unlimited clay" offered by ZBrush and Sculptris, they are more than adequate. Actually, "unlimited clay" will be coming to Blender soon enough anyhow.