Something I hate is when you level up a character and make it look so good, and then your hair doesn't match your hat or the outfit just doesn't fit your avatar. The things we do aesthetic.
Something I've seen a lot of games do is add a boutique, where you can change your avatar's appearance if you don't like it later on. Usually it costs game currency, so if we added one that you could buy changes with crowns for, like maybe 100 or 200 a change, that'd be so much better than considering starting over a character to find that perfect avatar.
I know I have a few characters whose appearances I'd like to tweak, but I'd hate to have to restart.