Musoka is right. There's no way to change it right now.

If it's any consolation, the devs have said that they're planning on making some changes to the character creation models, by adding new races and genders and stuff. When they do that, we're supposedly going to get the option to choose those new character models. I'd guess that they're also going to add new hairstyles and facial models, at least. So when they do, I think we'll all get the option to change our characters' appearance.

But that probably won't happen until after all the battle system changes have been made, which will probably take several months. Maybe by that time, you'll have fallen in love with your character's appearance.