On the topic of hands, I find the original design to be a bit too glove-looking (of course); the original Alien was still too much of a man in a cumbersome suit (and that's what made the film great, it was hidden, never seen as a whole (except when it is ejected into space, and that looks like a tall man in a suit). Personally, I'm a fan of the fused-finger hands, specially if having the extra thumb and it not being a floppy piece of plasting. Perfectly symmetrical skeletal hands are unsettling.
Dome and dome-less; I could care less, but please don't use those odd ridges if you take out the dome; the original pattern is suggestive enough.
Feet, resemblance to the host species is a nice touch. Long-metatarsal feet for dog aliens, inner dewclaw for predaliens, and... Wait, human aliens easily become a mess. Anyway, plantigrade feet, tiptoeing walk, hunched over posture. May be because I've spent far more time playing the video games than watching the movies, but any time the alien stands upright, it hurts my suspension of disbelief a bit. However, nothing like the Resurrection ones. Friggin JP Raptor ripoffs.
The tip of the tail, I'm growing attached to the bladed variant. May be due to Bishop being impaled having quite striking qualities that a barb doesn't do as well. As for the tall neural spines near the tip, well, makes it look like a vertebral column even more, and gives the tail an eerie flowing effect, but it also goes fine the other way.
Also, one thing I never quite liked, was the spine-like "head rest". It just looks cumbersome for the creature to "look" up (or down from a ceiling). That's what I liked from the runner. Still liked the tubes, tho.
All in all, the AvP:R ones are the least detailed, looking far too much like rubber suits.
