Dua When Looking Into the Mirror

اللَّهُمَّ أَنْتَ حَسَّنْتَ خَلْقِي فَحَسِّنْ خُلُقِي

Allahumma antha hasantha khalqi fa hasintha khulqi

Pronunciation: O Allah, just as You have made my external features beautiful, make my character beautiful as well.

Reference: Al-Hisnul-Haseen Pg. 206