Great character! I have a serious thing for 60's retro technology and especially robot design! Great work with the joints too! They look retro but with modern logic that favors functionality. And the color scheme is nice cause it can play out as both evil at the beginning of the story or as a gentle rogue (as the character reveals his true nature).
2 thoughts if you don't mind:
1) I'd love to see it punching a military issue robot, or a mutated monster, you get the idea. I mean Hulk is awesome but watching him punching tanks is not as fun as watching him punching the Abomination or the Hulk Busters.
2) The idea with the eyes is amazing and can convey a TON of emotion! But I would suggest to make the eyes project light so you can clearly see them from a distance.
Even though the Iron Giant is massive we can still see his eyes from far away. Not to mention that the moment the viewer will see a pair of red flashlights of doom, they will say "Oh, no". And if they say that, you got a win
Anyway just my 2 cents. I'd love to see more!