The actual Karlach is just a random npc. She will be totally remade, face, body, the broken horn, will look completely different. Also, it seems she will as big as Halsin btw
Oh that makes sense; I simply chose a picture of her because she was a female NPC that wore armor; that said from what I've seen most of the Tiefling females seem to have basically no makeup. I must admit that my selection has been somewhat racially broad; the reason being there is a shortage of Drow female NPCs in this game; at least as far as I know.