Looks pretty moist to me honestly, and ADI has spoken about Dan Trachtenberg wanting it even wetter than ever before and them being unable to accommodate, because the K-Y Jelly solution that they use just dried up constantly.
As for the mandibles in concept art sometimes they are present sometimes they are not for the sake of clarity.
Four times now I have seen the final design for the face of a Predator by ADI in either concept art or maquette form looking good, but then the actual practical head, does not look good. At some point here "what the director wants" stops working as an excuse for the final practical iteration, especially in the case of Prey, where it got replaced by CGI probably wisely.