I agree. The Alien on the back-box is a better image. The pinball is called Alien, not Green Egg.
The artwork is creative and amazing, but I don't think it tells the story of what this pinball is. The main character, the Alien, is on the side of the cabinet, which is wrong. It's all back to front.
The eggs should be on the side of the cabinet, at ground level, where they are in the movie, around your feet. The Alien should be on the back box, looming over you, 10 feet tall, like it is in the movie.
Also, you're not going to see the side art if the pin is squeezed in between other pins so you've instantly hidden your branding. The Alien creature is the branding, not the egg.
Look at Game of thrones, Kiss, James Bond, Spiderman, Playboy, Terminator 2, any machine really. Main character: back box.
As a side note, If you could see the side of the cabinet, and the eggs were say about 16 inches tall, imagine the lighting effects you could get with green and white light on them if the LEDs were controllable.