My eyes and smile are asymmetrical. Is it due to muscular imbalance or are my braces affecting my facial structure? (Photo)

2 years ago, people started to notice that my smile is asymmetrical. At first I didn't mind it but since I am a growing teen, it started to bother me and it seemed to worsen as time passed by. I also noticed the same thing with my right eye which is smaller so my hypothesis is that the right side of my face has weaker muscles. I've been wearing braces for 4 years now and I'm wondering if that could also be the reason of my face's asymmetry. Your response will be greatly appreciated!