I'm not going to make a bigger deal over my wife's graduation than a friend's graduation I attended years ago
Which one did you have the most fun at?
I'd say my friend's graduation, but his was insignificant. When I look back I think it was more of an initiation ritual than a completion of study.
You should be happy for your wife. Its a big deal for her and she is married to you.
It's just a picture. Who cares.
I think that she might be upset to know that you are feeling this way. I think she expected you to be happy about such a big accomplishment. You should try to let her know that you are!