No more saving as JPEG!! If it's possible, save as PNG[Portable Network Graphics]!!!
Anyhow, the shading is ok, but it could use improvement. Look at the normal sprite, see how the colors look together? When you change colors, things still need to blend as before, just in different colors. For example, the glare on Parasect's claws, you have too light of a blue, if ya know what I mean.
The Metapod is too dark, lighten it up. Don't do it to the point where it's too bright though!
Glalie is pretty good but it's too blurry to really tell, nice color choice though
Porygon needs more shading. The bright colors are fine if the shading is good, remember!
Keep practicing!
-Torchic23