'Look sharp, Strongbottom'

Turns out, when I'm left to my own devices all day, I STILL only draw Harry Potter fan art! Here's a scene from Professor Slughorn's Christmas party, grabbing a firewhiskey from poor abused waiter Neville. I gotta say I never cared much for Slughorn in the books but Jim Broadbent really gave him some charm! That man is delightful.
Can you see who's having a terrible time in the background? I wonder who she's talking to under that mistletoe...