I finally finished this drawing! lol
I really wanted to practice drawing backgrounds so I did this based on the final boss of Sonic Adventure. I love that game! I tried to complete it 100%, but there are like 3 missions I can't finish. Crying

Perfect Chaos may look a little bit off-model, but I drew it based on a screenshot from Sonic Adventure. I know It got a new design on Generations...but I don't like it that much... It looks...Robotic (?) to me, even though someone from Sonic Team claimed that it was Perfect Chaos' original design from the start, but due to limitations they had to change it.