Since a comment was made about portraits, there are some handy tools out there for folks that are not masters of character modelling. In a contest last year I won a limited edition version of FXRealm's Creature Creator. Essentially, it is like DoGA, but for critters rather than mecha. It features a slew of body parts and facial features that are morph-able. Pick your parts, tweak, export, and then apply any appropriate textures in the model editor like Metasequoia LE.
Some examples I whipped up a while back...
http://www.geocities.com/tzircher/alien_trio.htm
The down side is that the retail stand alone version cost 149 euro or 199 USD.
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TAZ