It does look a bit meatier than the rest of her, but it's a bit hard to say just yet. BUT, one thing's for sure though: That hand ain't quite right. It's really difficult for me to tell how exactly it's placed on the arm rest, and the more i look at it, the more it looks like it has been smashed flat against that arm rest, which seems much too painful for such a happy face. I'm assuming she's meant to be kind of resting her hand, but dat wrist angle m8. If we for a second ignore how bad i am at drawing hands,
here's a possible way to do it. Also note: The inner thumb joint really isn't that exposed, it's actually a bit behind where that skin flap between it and the index finger attaches.
Also, if it weren't for the fact that it's literally for an "Anime us" contest, i'd point out the generic anime mouth as being a thing that really only belongs in animation, but given that the entire point of it is to look like an anime... Well, you get a free pass. I am also not of the impression that this is how you draw mouths normally. :v