You started to add muscles on the unfinished skeleton. It's usually better to finish overall forms and then to add other layers. It also seems that while you're doing the right thing you're pushing yourself too hard and don't have a fun time. It's a sure way to get an artist block. Try to make something small for fun. PS I…
Is there a way to load an alpha mask into World Machine and run that like a mask, similar to the Layout Generator? Say I want an island in the shape of an "S", make a mask in PS and then bring it into WM, use that set the limits on an effect.