I'd remove the interior black lines.  Hue shifting might help as well.

Good stuff.
The stick-thin neck and shoulder joints don't really lend themselves to guy-in-a-suit cheesiness.
Arms and legs both look rather stumpy, but I guess that is a stylistic choice.

I like this. If it was a little less mirrored, it'd look a bit better, IMO.

It could use a little highlighter here and there. And the stand
could be more dramatic if everthing wasn't so mirrored.
Good impression of strongness!