Camus, my favourite non-game art pixel pieces are by Lazur and Cyclone, as one would expect. Specifically, I love the series of sea paintings by Lazur, as well as his elmore rip with the girl by the river stream that is BETTER than the original. Cyclone, I love all his stuff, but my favourite would probably be the deep-sea fish.
Mermaid's pirate pc for C64 forever remains one of my absolute favourites too.
I would link to all of those, but gfxzone is down.
To those of you that link to pixelation artist pics, no offense, but investigate the medium, outside this forum. There's people that have reached incredible heights with the artform, 5, 10 years before st0ven or Kon decided to pick up a pixel brush.