When I open AirDrop on my Mac (10.12.2), my iPhone (10.2) shows up but the picture is wrong. I'm not even sure who it is or where it comes from.
My wife's picture is correct though. I've checked my Contact Card on both my Mac and my iPhone and they both have the correct photo of me.
Best Answer
Airdrop appears to use the picture stored in iCloud. To change it