I did a lot of character artwork in preparation for Invasion, starting with model sheets that other artists taking part in the crossover could use. These weren't professional-level model sheets — I don't think I've ever done any of those, and in this particular case, the artists would be free to reinterpret the characters in their own styles. I just wanted to lay down the important characteristics of each character.
Model sheet for Ottar. Not much to say about this one, as Ottar tends to look the same between stories: naked, green and without much in the way of body paint or other markings.