Mario Sunshine - Delfino Plaza 2D

[Vipershark]

Yes, I know the shine is pixel art. That's why it's the biggest issue. :p
It's still pillow shaded though, which, as said, is a big issue.

As far as the the rest of the things that actually -are- pixelled, most of them are also pillow shaded as well and/or don't convey any depth which makes them look flat.

I know this is intended for a sprite comic, but that shouldn't make it any less important that the background is consistent and well-pixelled. Having your background match and complement the sprites that will be on it will just make it look that much better.

For example, look at Neoriceisgood's A Path To Greater Good comic. Note how all of the backgrounds are custom pixelled and match the sprite style used for the characters. They look natural and like the characters are supposed to be in those areas.