Really like this set.
I'm not usually into the whole muscles/grotesque sets but this one has a cartoony feel which I really love.
Particularly love the chest and lumbar joint, makes it look like a manic smile in the middle.
Pecs make it look like a proper face on the chest - crazy shit yo
Would've loved to have seen more more variety within the set, perhaps with mouths being the main aspect, but some eyeballs and stuff like BenD's suggestion would have been super sexy
Overall, wicked job