Nice Job!
Just remember not to use 100 percent black when you polypaint him.
Zbrush seems to use pure black as masking, so if you try to pose him nothing that is 100 per cent black will be affected.
I figured that out when I was transposing my dragon model. The claws would stretch like gum.
And you should download transpose master. It is a VERY cool plugin, easy to use. It will let you pose your model in one shot, seeing as his tongue is a subtool. Are his teeth part of the body, or are they a subtool?
A link to some of myu work: let me know what you think
http://www.zbrushcentral.com/showthread.php?t=103327