i'll just talk about all three of your icons here
after looking at your mud pick icon, which i really loved, i was dissappointed to see the decline in quality in this icon and the granite pick icon
the shading, especially on the metal handle is undefined and looks rushed or unfinished. on your mud pick handle, you put the wooden texture quite well but in this one, your representation of the steel handle was quite bad. on the granite handle, the rough texture makes the shaft look as if it was all bumpy and damaged
the edges in general are undefined, fuzzy and jagged where it should be straight. the smudged glow does not help either.
you should go for a clean crisp look you had in your mud pick. a pick is a hard solid weapon. not something insubstantial like cloud, fire or a smoke, not fuzzy and soft like a bear fur. it is hard and definite and your icon should represent that
i think with proper shadng, the handles whould look 3d naturally but i suggest you add some metal bands or somthing, like you did with strings in the mud pick, to enhance the 3d look.
talking aout shading, the handle on your mud pick lacks shading
you should also add a little colour variation on your granite