Yeah, but shading is extremelly complicated, even more since I don't really have much vision of depth on colors (some of the guardian sprites shows that). And the time I would spend making better shading on sprites, I invest enhancing the mod systems. So even though It has bad graphics, the system compensates.Well, I have tips. First, actually spend time on your sprites and compare them to the original terraria characters and see if they're good enough. For example, the starting wolf companion could have some fur detail and better shading. The companion armors could use some more detail, better shape and shading.
Me? I'm glad the sprite is like this, even more since It could have been far worse, since initially I wasn't even bothering about adding light shading.