Like the Hellknight, I really like the design of the imp in Doom 3 a lot, so making this felt a little redundant. I gave this bad boy more Hellknight-esque mouth with the bare gums, so they seem like a distant relatives or something.
This design instantly got me to thinking about the Clone Soldiers from Serious Sam 3: BFE. A lot of classic baddies got interesting redesigns to make them look even more intimidating! (Though, admittedly, the Clone Soldiers were completely new to the game, though they functioned largely like the Zorgs from The Second Encounter and the Orcs from 2.)
Well they are one of the more common creatures in the game and really easy to kill, so it's fairly difficult to find them scary. Besides, I though Doom took a turn for the worse when it tried to be a straight-up horror game. Don't get me wrong, I love me some good horrorgames every now and then, but Doom's point was not to be scary, although it totally was when I was a kid