I feel sad about this. Am I being selfish and self centered?

Today I went over to my sister's house. For years I have noticed that she never has any pictures of me round the house (she has pictures of friend's, distant aunties, aquaintances etc etc) but she never has pictures of me anywhere, and I am her little sister (she's 37 I'm 27). Today, I went in to her little girl's room to play with her and on the wall there is a collage of all the people my niece knows (everyone from her babysitter, the local butcher, gran dad, playmates etc etc) There was one picture of my daughter, but none of either my husband or me. I felt a bit upset about this. It's not that I think I'm so great that I think everyone should have picture around the house of me. But I think that if you love someone, you want to be reminded of them (or something like that anyway). Would you feel a bit hurt about that?