Probably old, but still very cool:
https://www.facebook.com/media/set/?set=a.232323176777744.70785.198918470118215&type=3
lol @ Catelyn vs Lady Stoneheart, and Reek xD Quaithe, Xaro, Chella, Hot Pie and the Ghost of High Heart crack me up also.
He even drew super obscure members of the Golden Company, the Brave Companions and the Brotherhood without Banners, lol... kinda weird. I'd have drawn less minor characters that actually have lines instead, such as Pate (Oldtown), Alleras/Sarella, Marwyn, Chataya and Alayaya, Jeyne Poole, the Green Grace, Roslin Frey, Septa Lemore, Dalla, Chett, post-change Jaqen (aka the Alchemist), Merret Frey, Taena Merryweather, Lollys, Big and Little Walder Frey. Even Jhalabar Xho is less obscure than some of those he drew, lol.
Then again I think those mercenary company/brotherhood artworks may have been requests... hmm.
Edit: another, very different but still cool artist:
https://www.facebook.com/media/set/?set=a.1783503516919.2100361.1519422246&type=1