I've never worked well with perspective, but I think I got something that seems like a good start to me.
I didn't really use a reference, I've drawn Metal Sonic enough to know what he looks like. Here's one you guys could use as far as critiquing goes though.
http://farm3.static.flickr.com/2015/2533408625_b537faa8bc.jpgEDIT: Got some basic shading down, not worrying about palette at this point.