it's just random stuff, mostly
I don't collect fantasy images in general, but every time I'm looking for something on the web (a new artist, an article, a review, a game, some kind of wiki about some stuff i don't know) and I see a drawing that could be used as a portrait, I save it
and so I'm a little bummed ny the fact that Aumaua are 'unique' looking (which is a good thing on his own) enough that is almost impossible to find portrait that are 100% good for them... i use some 'triton/mermen' and things like that, but only few are actually good