With regard to your comment of the transition between Maya and Zbrush - I think thats very very valid with this type of work. Its actually the reason I really opt for pushing the mesh as far as I can in Maya without relying on the sculpting as its not a dead cert once you start mucking around with the displacements. I dont think Ive ever read a post where someone has applied a dis map and been trully happy with the out come.

I think the nose is too broad in its width all the way down, it needs the variation to the tip (look at your references). I think thats what is giving the cartoony feel. The lids top and bottom need some attention lowering and raising. And perhaps a little adjustment to the brow muscle it needs a bit more meat and lowering a tad too.

another 10 cents.....

J