I usually like to do cartoon animals, check out my website, http://mysite.verizon.net/~aen916/ , if there's anything you like let me know and I'll do what I can to help you.
There used to be a dented or crumpled (trying to remember which - not at my pc right now) texture that came with older versions of AM, I think that would really help aging, I've used it for rotted teeth in the past.
WOW!!! It looks like like Robert Downey JR. has some serious competition. I showed your pic to a friend who is a serious Iron-Man comic freak and he was truly impressed. Keep up the great work. (How about an action pose so I can use "Shellhead" as my windows wallpaper? )
Tar looks great, but I can't help ask, why do animated hippos like to wear thongs? (see also Kozo - http://www.youtube.com/watch?v=ZSmegm4Gn4s...ted&search= )
oh I forgot to add if you need reference pics - check out http://www.speedracer.la, they build and sell Mach 5 replica's, and have completed a Shooting Star as well.
Andy.