Could this be what is inside the suit?
This is my thought exactly. This is not the suit. The suit is in the Ampule room, and the helmet to the suit is what they are scanning in the lab. This is the actual skull/head, and I think this is the skull that fits inside the helmet. Up to now most people (including myself) have assumed that Mr. Giant Blue guy goes in the suit, but I don't think so now.
I'm starting to believe that we will have Engineers (blue guys--god), and Jockeys (possibly one being a Prometheus) being completely different species. My guess is that the Jockeys were created by the engineers to be subservient to them, and use them as slaves.
Also.. I don't see a facehugger in the slightlest. The nose resembles the same texture as a facehugger tail, but I'd be pretty surprised if a jockey rips his nose off and sticks it on someone elses face