While I don't want to speak on the behalf of Xav, he's on holiday for a few days - but he doesn't, so far as I know, collect fanart, that being the only place you're ever going to find female Mudokons, thank God.
However, I've done a bit of searching, and I've found Slaskia's old site.
Check out the images under the 'Mudokons' subheading.
I also found
this, but nothing further.