Thanks!
The thing is, that even tho I made ~45 sprites, I still don't know what exactly I'm doing wrong with a majority.
Obviously, I can tell when I see the final result... but it's usually too late.
Sometimes the shape of the item is off, but when I try to correct it, it gets worse, so I ctrl + z to initial state.
Sometimes shading is too smooth, but then again - I make it too noisy.
I cannot find the compromise, don't know when to stop or what I should focus on.
I don't even know what makes "good" sprite "good" from a technical point.
Finding tutorials in this matter is also a bit tricky, some pixel-art tutorials have way different style; most tutorials are "do some crazy sword" and do not teach how to sprite, but rather how to create this exact item.
Also, my shading is kind of "random" - I just "think" that it should be this way. I would rather like to "know" it.