In today's 15 minute session i took a base mesh i had modeled (with testing topology in maya) into Zbrush and sculpted a quick squash shape. Then i tried to see how the topology could be improved .. like i notice a weird 5corner too close to lips and under the chin.
Hope this is helpful.
here were the zbrush sculpt on maya topoed mesh (i previewed in zbrush by going to a higher resolution)
some neck verts were moving in blendshape so i painted their weights out
here's a prelim test i made seeing the trouble face areas
Inspired by Mark Simon's Facial Expressions a Visual Reference for artists