This is what has helped me. My husband, who is in regular shape and handsome, criticizes himself in any photo he sees. The first thing he does in a group shot is look at himself and make a critique. He's crazy! He is nearing 50 and only sees his age. I look at him and see a handsome man.
Once I noticed how often this happens with him, I started noticing that most other people do the same. It's like nobody looks at a whole picture and enjoys it anymore, they just zero in on themselves and pick.
I started "glossing over" myself in photos. I look at them, but not in detail and do not let myself say one single thing. I try to look at the composition of the whole photo. I have told myself that others will enjoy the pictures when I'm dead and gone... seriously... who is going to take a look at their long lost love and say "wow, look at that double chin!" and not "wow, look at that twinkle in their eyes!". Now I can look at pictures and enjoy them instead of taking a tumble down into the depths of despair.
Although, I will say, that if I see one that I think looks good, I will take a closer look.