Mario Sunshine - Delfino Plaza 2D

[Vipershark]

The number one biggest, most obvious issue is that the giant Shine in the tower is pillow shaded.

After that it's the fact that like half or more of the image isn't even pixelled and was done using digital art tools.
Of the stuff that was pixelled (and even the stuff that wasn't), most of it has a lot of issues with shading and lineart and whatnot.

You have a decent base I suppose, but this is in no way (completely) pixelart. There's a lot of fixes that need to be made to get it to that stage. A lot of it clashes.