Sup, Just looking for some Criticism.

[Sketchasaurus]

Low contrast between shades is a common error that I've seen on sprites made by newcomers. even though it may look nice and smoothly blended when zoomed in, it makes the sprite look flat.

I also noticed that, even on areas where used in a very small area, every color has 3 shades. This kind of thing is unnecessary, especially in cases where a close color is used elsewhere on a sprite.

To get you started here on TSR, and to make crits easier to understand, I suggest reading up on the Spriting Dictionary: here

In addition, here's some tutorials for more reference.