I was told to draw full plate armor, and I focused on the larger pieces so the layered plates didn't too closely resemble the overlapping scales on the Lizardman. I believe the muscled breastplate is Roman. Scott's D&D character wears an intimidating skull mask like T'ocs. Though I tried desperately to avoid similarities between my monsters that went beyond common style, I enjoy T'ocs skull mask as a throwback to the Skeleton monster. T'ocs is such a tough SOB that he'd take part of another monster as a trophy/armor.

Influences: Vlad's armor in Bram Stoker's Dracula, glass armor in TES Oblivion, Juggernaut Armor in Dragon Age: Origins, Ned Kelly
Here's T'ocs without the mask, with Scott's face underneath: