Your sprite has way too many colours, I counted eleven. Some of which appear once or twice on the sprite, and could have easily been replaced with a colour already in use.
This is a revamp of one of the sprites you posted, the only difference being that there is only four colours, instead of eleven. Doing this cleans up the sprite a lot. Again, there is a ton of pillow shading all over the sprite, try adding a glare on his head, since the character is bald, and find a new light source.
And, if we do these simple steps with your sprite...
There we go! The sprite's light source is shown by the "sun" in the top. The glare gives the viewer a clear idea of where the light source is coming from, and the shading further improves the sprite.
This is a revamp of one of the sprites you posted, the only difference being that there is only four colours, instead of eleven. Doing this cleans up the sprite a lot. Again, there is a ton of pillow shading all over the sprite, try adding a glare on his head, since the character is bald, and find a new light source.
And, if we do these simple steps with your sprite...
There we go! The sprite's light source is shown by the "sun" in the top. The glare gives the viewer a clear idea of where the light source is coming from, and the shading further improves the sprite.