Not sure if this helps for those still puzzled over the head / angle, but what I'm personally seeing (on fear of stirring more memberberry complaints) is a very similar shot to what we saw in Alien 3 but flipped.
It's definitely a full length head, but the angle and fact it only has a partial dome is what's making it look a little off in the shot. (Excuse the rough doodles, I'm drawing with my finger on my phone) so green outline would be the head, purple the partial dome, and grey lines if it'd had a full dome;
I get the impression the character is sitting on a ledge, the xeno is crawling upwards towards them, and peering over and down at them; so like the Runner/Ripley shot, with front of head higher, back of head lower, and body would be vertical as opposed to on a flat floor (am I close
@Mike's Monsters?)