Sorry, dude...I personally don't like artwork with every single arcade character plastered on the side. It's just so "clip-arty" for me. Ultimately, it just looks like a cab that can't make up it's mind.
I'm a broken record on the phrase but "less is more" when it comes to arcade artwork. Try to focus on one particular category, theme, color, or character. Something more specific is better than everything everywhere.
Start with what game(s) you like best. Or maybe what era you like best. 80s or 90s maybe. Try to keep it SIMPLE.
Just trying to give some good feedback. I always remind people that I'm not an artwork guy so don't ask me "hey if you think you can do better than prove it". Well...I can't do better.
However, I know what I like when I see it.
But hey, you are the only one that has to like it. I'm just some random dude on the internet. It's your cab, YOU have to like it.