Yeah, I used that to create the base of the species. It's still pretty basic despite being an amazing piece of work.
What I am trying to figure out is how to make the pictures match the sex as it does with Humans and other obviously bisexual species. Also, how to create a new species-specific names list. I have yet to find the base game XML that has the names lists in them to start with (there are a lot of XMLs and they're all over the place).
As far as artwork, I am actually considering commissioning some just for this... which is a really cool but dumb idea. Otherwise, purely open-source and/or free-use license images.