I think I am almost done with this guy, but I am thinking of building out a little scene to put him and explain the heavy dust and give it a bit more story. The modeling/sculpting is all ZBrush. I tried poly painting and separating material for once on exporting to KeyShot. I'm also using a curvature pass to get my heavy dirt/dust layers and doing all the comp in Photoshop.

Let me know if you have any feedback. 

Thanks!

This was an earlier version, so you can see the progress.