This is an illustration of area 12 (ORC LEADER’S ROOM) from module B2 The Keep on the Borderlands. It’s from the pen of Cedric, who runs the blog Hors du chaudron de Koscista Noga.
He has lots of other nice work too, like this creature, which was the outcome of a LotFP summon spell. I’ve been really enjoying his stuff. Check it out.