The tree in the last piece is wonderfully magnificent. Love the Demon Hunter lyrics in it, too. I like the tiny bits of color here and there, like on the eyes and shoulder, and the red laser is nice and crisp. I think my favorite part is the tiny little bit of blue in the center of the figure's torso. His shadow could have been worked out a bit more, since it feels a bit weak compared to the tree/rocks/weeds in the background. But overall, a very well done piece. Feels very tranquil and foreboding.
The tank drawing is cool, as always. Interesting perspective and line work. Definitely seems like you've developed and improved as compared to the previous realistic tank renderings. Which is great.
The random Kermit was unexpected but amusing. And a barbed wire chair sounds super uncomfortable, flames notwithstanding.