Like you pointed out in the previous comment, Black background, no smile, no forced sense of mirth. How society puts color value of white over black is also apparent in religious contexts as well as terms like "the Enlightenment". Dark or in this case black has always been looked "down" upon by society in general. This is not only apparent in the images above, but also in storybook concepts and Disney movies if you look at the protagonists compared to the antagonists.
I will say I don't know where the images are from, but either way, it does have subversive tones of racism and all sorts of loaded societally imposed goodness.