These are studies exploring 'robot gore.' What's robot gore? What it looks like when a character gets blasted by an enemy, by an assortment of weaponry. I won't waste time on explaining them - click on the images, and all the direction is written below the image.
The characters are production and marketing images, I just provided the F/X and gore!
And this is the first image that came to mind when I was asked to illustrate some robot gore.