As it stands, it has potential, could have cartoony appeal but this is a wonky sprite.
It has construction problems, I.E. lack of foreshortening
For this stage the Loomis books are good books about constructing figures.
Figure Drawing For All It's WorthFun With a PencilSacred stuff for a lot of people starting out and easy to follow.
Cure's tutorial sums up the basics about colors, shading, banding, most of the other problems with this sprite.
Had a bit of spare time, so that having been said, here's that 75% done sprite edit/redo/thing.
Completely different art direction
No progress shots of this unfortunately, BUT hopefully this will be edited with a quick breakdown of some things that went into this.
It's not really as complex as it looks.
Just uses some extra principles that are vital to making a piece look awesome.
Also, looking at your sprite from a distance actually is a way to make sure it reads well.
Looking at something up close gets you get caught up in details.
If the big picture doesn't look good that's a major sign.