These are fantastic! I've taken your pic and added some numbers so I could comment (I hope you don't mind).
Changing this color has a very significant impact on the overall look of the game. The original red is a nice tie in with all the red in the playfield... it also makes the POA pop. That being said, I think green would look really great and balance well with the existing artwork. Your original green sample (previous post) matched really well with the darker green in the plastics artwork... not sure if that's shown here (it may be #4 but with pics/lighting are sometimes see the true color)... but I think that's the best green IMHO. All the earth tones (2,5,6 and 7) would look great as well. It looks like for 9 you went with a color that is closest to the original ruins. I also like that because it adds balance to the game.
What about a tan color that is close to the plastics that sit below the POA??? It's a light shade of tan... that may also provide a nice tie in to it.
Anyway I'm getting one... I like sticking with the original style for this machine. The realism effects look nice but I think because the overall look of the game is "toony" when you go to realistic, it doesn't look right... that's just my opinion.
Again these are all fantastic, you've chosen all the right colors and tones, not a stinker among them. Its purely a matter of personal taste as to what works.
colors (resized).jpg