I've been told I appear angry when my face is totally relaxed. Yeah, I have one of those faces, I guess. Not very INFJ-specific, though, I imagine.
I do actually carry a look of what might be described as genuine frustration or anger when I'm deep in thought; I'd know, people have taken pictures and shown me. As such, I often find myself having to assure people that I'm not in as much psychological agony as I appear.
Other than that, I have a face that smiles without smiling - a smirk that makes me look like a smug asshole more often than not.