Basically in making this i made mostly use of two insert brushes:
insert cube, and insert sphere. and the move and clay build up brush.
A neat thing about using the insert sphere and insert cube is we can begin to block out parts we want to later model. Like here i blocked out the torso with a cube, and the shoulder with a sphere. Basically i started with the face and used insert brush but then split the masked points into new group. This produced new pieces i could work on separately.
Here is my current original concept I modeled and designed:
Another major thing that i talked a little in one of my earlier posts is using drawovers to kind of mark goals we want to go for technically both in rigging and in modeling. I remember John Lasseter mentioning in one of his papers about art challenging the technology and the technology in turn inspiring the art.
Hope this is helpful.