Just got the e-mail from Sega...I'm one of the 50 winners of the UK side of the Sonic CD fan art contest! Yeaaaah.
So here it is! Based on one of my favourite discoveries as a kid with this game: the hidden artwork in the sound test. It's mainly a re-creation of the MC Sonic art, but also has little elements from some of the other ones (all but the tails "See you next game" one).
Characters drawn in Illustrator, coloured in photoshop. Really wanted to give this a 90's dance scene vibe as that was the feel the game (at least the Euro/Japanese one I grew up with) had in it's soundtrack and in some ways in the art style. Huge influence on me as a kid.
EDIT: fixed a major mistake I hadn't noticed all this time. If Sega posts it on their blog it'll still have the mistake, doh!