@minette.
Aa omg they all look amazing so far!
My favorite is definitely the whisp/smoke tail, i love them all though<3
I think with the floppy ears, possibly a little shorter?
Also, some ideas for mutations are possibly fins on the back (similar to vapeoreon the pokemon), rare or legendary? Maybe the rarity would match the rarity of the mermaid tail?
And possibly a legendary mutation, dragon wings?
Or maybe dragon horns?