Work from back when i worked at Day 1 Studios 2 years ago.
these were the 2 final design approaches that we narrowed it down to during the development of the FEAR 3's EPA design. In the end, the design of the EPA was based on the one on the right.
Wish i could find the concepts I did of the smaller power armor. But in its initial design stages, it was loosely based on the design on the left, mixed with the REV 6 suit in FEAR 2, and collaborated upon between me and fellow concept artist Elliot Lilly.
It was eventually modeled by Boris Fisher, a pretty cool guy who can do an awesome Paxton Fettle impersonation, as well as imitate the voice that one Barbaroi dude Benji from Vampire Hunter D Bloodlust