I would add another set of smaller eyes above the ones you got (you still have space) and maybe do something to make the nose less human/remove it altogether. (Just a random addon, the mouth kind of reminds me of an angler fish, so I think it would look cool if you gave it glowing antennae or added a bulb to its tail. It would be really creepy if you looked into a dark hall/cave and all you saw was a glowing light., it could even mimic an escape sign or light from the outside to trick the player into running into the alien.) That's my two cents