A good idea, as it's meant to be the Yamask's face when it was human. It is why you may catch one looking at its mask and crying. I'm sure if it hasn't caused any harm so far it's well taken care of. [Or some very fortunate dumb luck.

A slow nod, arms resting as hands folded behind his back.]

Shouldn't be one at all. He will need proper exercise of course, and perhaps socialization; which can be as easy as allowing Totodile to play with other pokémon, and perhaps other pets as well so long as interaction is monitored at the start. Just in case someone doesn't get along well.