I feel like this dog in particular just stares into your soul on a rather unnerving level...

All dogs stare into your soul. That or they sniff it. 

That hulk looks to be more like a buff Stevie wonder than a green dude. 

@veldora I thought he looked rather "brown" instead of green as well lol

The background is skewing your eyes away from the intense hues of green. 

@ARikozuM I did the eyedropper thing (to sample the color) on the pic in 3D Paint and then looked at just the color again after 20 minutes and it still looks like that shit brown color...

That’s racist.

I was partially kidding. A monitor and software will always return X value to you, but seeing something by itself (fullscreen with black on all sides) shows a usual color phenomena used in paintings and drawings.