I'm smiling atm because I thought of this award category when I saw a picture of Carlie and thought, "Ahw, she has a beautiful smile. We should have an award for that.", and now she's been mostly in the lead so far.
I really like Aaron's smile from the pic he has with shorter hair & outside somewhere. idk where or when it was taken but I always imagine he is greeting someone who is about to take his arm & be totally focused on him. It's a lil cinema scene that plays in my head every time I see it.