I think it's cause she actually looks for REAL happy here. like no fake smile. and the eye makeup. she is one of those people who looks fake a lot, you can tell shes acting. thats why she looks so different here, cause she is smiling for reals.

Honnestly, i see no difference at all.

I absolutely agree. I saw it on the main page, and thought the EXACT same thing. I can't put my finger on what it is exactly, but her face definitely looks different. Her smile, or chin, or something. I'd still say she's attractive, but something is a bit off.