The Poser morph brush will actually do you pretty well, in place of ZBrush, I would think, for playing around with Tyler's facial features.

The morph brush is definitely pretty good in the latest version of Poser 9 /2012. So don't overlook that with all the talk of ZBrush... I'd say.

But... the biggie with Tyler, is that he is Face Room compatible... an aspect that is important to remember I think for Tyler (Ryan2), Anastasia (Alyson2) and Miki4.

You can always take Tyler into the Face Room and see what you can do with him there ;-)