User blog comment:G0LD3NF1RE/Skyrim DLC picture?/@comment-212.130.145.54-20120416203317/@comment-3416913-20120416212850

I suppose it could even be the default Dragonborn, which would mean that the player is captured, imprisoned, and interrogated by the Thalmor.

But the only significant differences between the unknown male in the screenshot and the in-game Ulfric, besides means of animation, are their skin pigments and nose shapes. My theory is that Ulfric spent so much time in prison that his skin became pale and his nose was broken by a fellow prisoner.