The concept art is immensely cool! Very talented people worked on that film.
I'm still not into the 'Trilobite' design though... BTW why is it called a Trilobite? In the book it says the Trilobites of the Cambrian were the sort of inspiration for this creature, but then this doesn't make any sense. The Trilobites were very ancient arthropods and they had three sections to their bodies: a front section, a middle section and a tail section.
The 'Prometheus-Trilobite' is certainly not an arthropod and it doesn't have three sections, it looks more like an octopus.
Apart from that, cool book, it makes me want to watch Prometheus 2, or whatever they'll call it.