I was really inspired by The last of Us and the way they re-invented human zombie/creature style characters. Here's a human style kinda of monster/creature that may have been infected by some sort of disease.
Also, here's an alien concept study based from a concept by FightPunch.
Concept sculpted in Zbrush using Dynamesh from a cylinder. Then decimated and sent to Maya using GoZ for final Render. Rendered with Mental Ray in Maya. Then composited in Photoshop.