Very awesome looking artwork. Any ideas on what you want the button colors to be? I could see a lot of colors contrasting with each other in a good way, and some in a bad way. And if you have an actual name to the control panel, like its going on a cabinet or something, you could replace that Game NOT Over on the bottom w/ the name of your actual arcade, because it feels a tiny bit out of place. Like it looks all professional then it has that little quote thingy which just seems out of place of the professional look.
Btw Masamune Shirow art is freakin awesome! Which art book did you grab that out of? I'm sure you have it, but if you don't, pick up "Ghost In The Shell" published by Dark Horse over here. I've got another one of his comics "Orion", super bizarre explanations, very detailed and long. but extremely cool stuff.
-Looks good, excellent color contrast on the panel