It has a human face, but it doesn't look like any human race we've seen-- its arms are too long and spindly looking, and I see a cobra-like hood around the head and scales on its chest. More importantly, it seems to lack any obvious legs. Could this be a Tsaesci, and a hint that Bethesda hasn't completely abandoned the vampire snake men angle? Or else, maybe some Akaviri guardian spirit or deity?