Interesting. I've never thought of that. Although I'm sure instead of criticising your appearance you should say alhemdulilah or mashAllah when praising yourself.
Concerning looking at yourself in the mirror, I know it's recommended to say a dua'a (which most people don't know unfortunately):
Dua'a when looking at oneself in the mirror
الحمد لله الهم كما حسنت خلقي فحسن خلقي
Alhumdu lillahi Allahumma kama hasanta khalqi fahassin khuluqi
“Oh Allah! As you have beautified my outward/physical appearance, then beautify my inward appearance (character)”