If this is based on the 1986 Warrior design (the only non-Queen Xeno in Aliens) that's exactly how the design worked. The front of the head was smooth with an immediate change into something more reminiscent of a bone.
The back tendrils?
Those do not end with a spike. On the design (this applies to the 1979, 1986, and 2004 designs to name a few) they're tubes with open ends, and there's no pointed spikes at the ends of them. I've seen every movie in the franchise and own some fairly accurate figures; I've seen this design a lot. Trust me.