This is true, we all have things we would like to change about ourselves and we don't see ourselves as others see us. You're beautiful to your partner and it seems to me that is the important thing. Beauty goes beyond skin deep as they say. I think it's not so much what is on the outside but rather what is in the inside. We would be very shallow people indeed if we based our liking on what a person looks like rather than who they are.

That being said, I've looked at your pictures and your partner is right you are a beautiful person. Try not to be so harsh with yourself. I don't think pictures do a person justice anyway. People always look better in real life than in a mirror or photo.