I have seen this ad on my facebook feed several times, but never noticed the icemungous ice dragon with the blue eye looking back at Bran until now.
This poster looked so professionally made, that I was sure it was from HBO. But no, I went HBO sites and social media and was surprised not to find it anywhere. It is a work of fan art made by someone under the name ertacaltinoz on deviantart.com
But Winter the ice dragon is coming soon enough. The IceBrandon is coming.