01-03-2015, 11:03 PM
Regarding to that photo study, I think you could explore the contrast between soft and hard edges a bit more, in order to achieve more firmness and a solid look. Besides, having a larger value range helps building up the volume, so don't be afraid of making some of the highlights brighter and some of the shadows darker; specially where the ambient occlusion happens, for example, where the finger touches the face, the wrinkle between the cheek and the nostril and in the superior palpebral fold, there shoud be a hard edge completely black in those places, because light can't reach them. Hope this helps, keep up the work! :)