Attached Link: http://www.digitalcarversguild.com

Nice detail in the knuckles! 'Grit' means dirt, soil, sand... junk to make something look 'used', 'battered', and 'abused'. Eric of Digital Carvers Guild (www.digitalcarversguild.com) has a plugin called "Anything Goos" that can automatically add 'Grit' to items around the edges. I have no idea as to what it would look like on a creature, it's intended for scratched paint, rust, and the like on stuff. There's a demo on his web-site that you might try on this to see what it can do for you.