Ahahahah this whole picture is a mess. I can't remember the last time I drew Metal Sonic, I CAN'T DRAW ROBOTS OR MECHAS. ;-;
Just exploring different kinds of coloring options in SAI. The idea here is that Sonic and Metal are kind of a mirror reflection of each other, and I put them in Stardust Speedway because it's one of my favorite levels. The concept seemed more badass in my mind, it came out pretty bland I think. =< Nothing interesting is happening, but I guess you can interpret it as the moment before the race starts.
Incidentally, I was torrenting the Sonic OVA when I colored this. I misplaced my old VHS, lol.
edit - Changed some things that were bothering me. Also fixed it, this is what the picture originally looked like before transferring it to Photoshop screwed it up.