Here you are, good sir:

www.planetminecraft.com/blog/tutorial-palettes-and-hue-shifting/

Nice job on the shading, but it needs hue shifting. You should also try to avoid perfect grays. Try substituting a desaturated blue for gray.

If you want to know how to hue shift, go check out the_soup's latest blog. It's super helpful when it comes to hue shifting tutorials.

*conjures a diamond from thin air*

Since he is meant to be a robot, radial shading, and any form of shading that uses more than 4 shades of the base is invalid to this guy. If I were you, his shoulder area could use some "ripping", or any way of "etching" blocky robot design on that guy. His power crystal meter should be shiny, and its "flow direction" must be to the top. One more thing, using pure black as an outline is a bit iffy.

THERE'S MORE ROOM FOR IMPROVEMENT, GO ON!

it would really help to hear from an expert

btw can you comment on my skins and tell me what i need to work on them

and first view

first comment, btw awesome and second diamond