Oh, I didn't even notice but I see it now, yeah! It looks pretty good, adds a lot to the leg definition.
On to other criticisms: The gun-arm doesn't really read as such right now, it looks more like a torn shirt sleeve. Perhaps some kind of gun barrel, attachment, or light of some sort to make it more clear?
Yes, the buster was actually the next thing I was going to get to!
Of course the projectile FX is going to give it more of a weapon look, but the base arm cannon design needs some work. I'll get to it after the holidays. One idea was to make it "fatter" but I had trouble making it look round instead of a box because of the limited pixels. The original inspiration was Mega Man's buster, but it could be something different.
I do know I don't want him holding a gun in his fist. It needs to be an attached gun arm. He starts of as a skeleton who attaches robot parts to his body (weapon, armor, slide/dash boots etc. left over from his robot enemies [this ties into the story of him becoming "whole" and meeting his maker, your basic quest for identity story...]) I'll need to think about this...
Edit: Just an idea.. How about making all the upgrades "bone related". Here's the Carpal Buster!
(just a rough idea)
I wasn't thinking of adding an Ocarina style "Navi" character, but this Carpal skull dude could work well as a Morte (Planescape Torment) kind of dude making some quips along the way