So, I've taken my initial sketch and created another that's a bit more fleshed out. I never really decided whether I wanted these characters to look more human or slightly alien, so I may be changing this again soon, we shall see.
As usual, I'm still not 100% happy with this, but I feel like it's at least a bit closer to what I wanted. It may be a while before I get back to this character again, so I wanted to at least share it's current incarnation before (in essence) killing the re-doing it :)
Edit: made a few adjustments to legs and elsewhere, and am now experimenting with new PS brushes! Still just the beginning stages - I'll post again when/if I get further along :)