One of the other faces? The image of the new Ice Warriors pictured after the break.
But when you realize that this blown up image is only part of of the bigger picture (look just to the right of the Doctor’s left hand) and then you start to look at the other images in the shards the Doctor is crashing through, well..you’ll see what I mean.
There’s a lot going on in this photo. Trust me on this. But I should warn you. There may be Spoilers. If you want to take a closer look, you can check out this amazingly detailed breakdown at Doctor Who TV.