Yes, you can easily change how your bear or cat form will look but the only was to do this, in my understanding, is by visiting a barber shop and changing the skin tone (and/or hair) of your Druid ...

Diablo 4 druid bear-slapping everyone" The only good thing about Maul is the enhancement that makes it Wild Maul, which is pretty nifty: it results in a 10% chance that an enemy you slap will fall ...