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workflow by ming21 | Realistic | 3D | CGSociety
Great 3D model process shown here. It's helpful to look at this and see the transition from basic shapes into a highly detailed mesh.
Zbrush Hand modelling complete process
Soule Designs - Skull studies
ArtStation - Amanda Seyfried, Zhanhua Liang
Planes, facets, surfaces to look for when drawing mouths.
ArtStation - ax ogre, TaeYong Choi