Its obviously the jockey to me, he's getting ready to take off probably right before the ship gets shot down. Imo it looks terrible, Scott has really messed up this part of the film and destroyed the wonder of ALIEN. It also looks like that guy was right who said the huge head was a bust of the space jockeys head, they look identical to me.
I don't care what anyone says, the jockey in ALIEN was obviously a skeleton with bones, it was not a freaking suit. I blame Linderof for this, he's a complete dumbass.