Hey, I got an error message saying that my work is not my own?
My "Paco and Taco Revamp" does contain a sprite made by a different artist, but it's used in comparison to show the mimickry of styles to my own characters.
I address Konjak, creator of the Legend of Princess game, and his style, as well as stating my sprites are the bottom two sprites in the image.

The usage of Konjak's "Kink" sprite was for comparison only.

Pixeljoint has a rule about all pixels in your gallery being made by you only.
Like Jeremy said, place a link to pixels or references or anything else in the art description.

Don't forget about trans backgrounds. Useless BGs.

I don't really see a comparison piece as a problem. I mean as long as it's probably identified as such and not "oh I made both of them", you know? My two cents.