Yukimazan's Sprite Topic

[Sketchasaurus]

I can't overstate the importance of developing solid drawing skills:
Instead of limiting yourself to a single style, try drawing from life and plenty of references. An understanding of how objects and living creatures function in life will only further help you artistically.

I also noticed that a lot of the colors are the highly saturated primary colour defaults and the shades are simply darker tones of the same colour: my advice is to avoid these things. A rule of thumb that I like to follow while shading is: the more shadow there is, the cooler the colour. by "cooler" I mean as it pertains to colour temperature (Warm/cool colours) This kind of thing is also referred to as Hue shifting here.

I'd definitely suggest having a look at the Spriting Dictionary Topic in this forum.