This is a solid drawing! I'm counting 3 values, so I think you can develop the value range a bit more. I made this tutorial for another student to simplify the process. Start out with the two darkest values, then add the lighter 3 values. Really focus on getting even coverage with your shading. Hope this helps :)

Any critiques would be appreciated

Nice colour choices in the first one and expression in the third one.

I am open to any critiques on this piece. It would help

Love the sleek design of the armor. Especially the rendering. I'd say work on your figure drawing cuz either u didn't have the knowledge to make different poses or what, but there's nothing much happening in the pose. Also, check ur structure too cuz some parts are made 2d. Overall the design iz neat, reminiscent of star wars. But ig u need the tools to make it the way you probably imagined it. I can see ur an artist in works so don't stop (ofc if u get burnout, that's a different case)