For those asking about custom portraits there is a great thread here: http://forums.obsidian.net/topic/71722-the-custom-portraits-thread/
As for mine while there are tons of pre-made humans, elves, dwarves, etc., out there, finding a bald blue Island Aumaua was a bit harder unless I wanted to go with a photo of someone from the Blue Man Group. The one bald Aumaua portrait included with the game just didn't work for this character. So I did an extensive search of any images I could find of Doctor Manhattan from The Watchmen, found a really cool one that someone did that seemed to kind of fit the art style of the other portraits in the game, and chopped it to fit. It seems to convey the attitude I had in mind for my character and I am very happy with it!