OK, I am a huge fan of Sonic CD. This picture greatly shows Sonic and effect the had on the timeline in the game. I love how it looks like he has brought the light back with him though a Bad Future sort to speak with the inky blackness around him.
I cant stress enough that your light is not a plain white or yellow flat color, I am seriously digging the green hue within it. It gives a more organic shade and I feel references the Good Future version coming through.
All in all solid work Great job on this.