Well, here ya go:
Yes, it's an edit, not a redo (although most of it was redrawn, and the rest adjusted). Pants are still a bit flat, and overall he looks a bit more like a farmer than planned, what with the suspenders and rugged hair. I'll edit this post to go somewhat in-depth about what I did in a bit, but the last thing I did was stroll it through one of 'em image-processin'-doohickeymajigs to desaturate the piece (mainly the blue colors) and give it a warmer tone.
Large, round eyes and rounded face suggest more of a young age than anything. With the nose and eyebrows though, you were up to something there. You want narrow eyes, perhaps bags under them, more defined cheekbones, thicker eyebrows.
Also broke up the symmetry, aside from accessories that required it, to give the details more variety.
You say this character lives in a world of "derelict technology and metal", so the steampunk genre was one of my inspirations, to start with. Not sure if it shows clearly in the end, hence the "farmer" comment.