The VG Resource

Hey guys!
Please review my Pikmin sprites:

Probably the color is regular, not perfect, but I really want a rating...

First off, you used way too many colors that are needed. Shapes are jagged and blocky. It also has no distinct light source, along with the fact that that's not how you shade a mouth. Speaking of shaking, it looks like you hap-haphazardly slapped it on with no real understanding of shape.
Finally, how can we review spriteS if there's only one of them?

not to mention the terrible idea of using a gradient to shade is something you should never, ever do again in your life.

All good points. It seems to me not a whole lot of time went into this sprite, or you are just inexperienced.
Pick a direction your light source is coming from, and then stick to only a couple of colors for the shading. Try and make it look natural. Somewhere so that it doesnt look like a gradient and that it doesn't look like a heavy outline.

Edit: Here's a quick, rough example of what the shading could look like to improve. I went to the length of creating my own sprite to demonstrate.
See how the shading blends rather then just changes colors?



Spriting is an art form and it takes time to get just right. So don't worry if you're a beginner. It'll come soon enough with practice.