I don't know the character in question so I can't give you a definite yes or no. I will tell you what I see though - a blond guy wearing a white outfit with a blue collar. The whole pic is filtered blue. This fellow looks a bit older than the one in the Aethereality pic.

I've had experience with LJ failing to show an avatar at all but I don't recall it mixing up any of my avatars with each other or someone else's avatars.

ETA: OK. This is weird. Refreshing your page caused a different avatar to show up. One that isn't in your userpics. This one's of a dark haired boy. O_o