I think the algorithm would show which photo the "most" users would like is. What if you're someone who loves cats like no other and puts a cat on your shoulder (or wears a cat t-shirt or something). You're probably going to have a lot less "likes" than a "normal" picture of you, but the odds of you getting along might be much lower (I'm sure the average individual likes cat people less than the person who picked a person with cats in their picture).