I have one full sleeve that is themed around Alfred Russell Wallace's The Malay Archipelago.
Design was me + an artist at my work, plus the tattoo artist, of course with fine line art from the book.
The other sleeve is a bunch of really varied pterosaurs on a dense background. Design was various paleoart images I gathered and the tattoo artist.
I want to do one of my legs with another archosaur clade, pseudosuchia. Mostly extinct ones, showing the incredible diversity but also at least one of the insanely toothy modern swamp dwellers, with some connecting background. I've got several ways to come up with a design, but I thought it would be interesting to investigate commissioning something from an interested paeloartist. I would pay, and pay appropriately. I haven't really searched for prominent portrayers of these bitey MF's in my book collection but mean to.
I'm sure some tattoo design experience would be a plus, as these can be hard to layout. It would probably end up being treated more as a rough design or image source, finished by my tattoo artist (unless I found someone who is also a tattooist).
Interested in DMs about this and also public discussion of any experience people have had doing things like this, sources, etc.