Pixel #art source versus how it actually looked like on an arcade, television and early home computer CRTs.

90's PC displays had sharper pixels but still had a mild anti-aliasing effect that should not be ignored in emulation.

Note how the CRT hardware anti-aliasing effect creates the detail of a face on the skeleton's shield, where as the source looks like an incoherent blob of pixels - this was because the artist purposely designed the sprites for the final CRT render.