Looking for advice on composition and background.

Before I added the spaceship I liked the image better. Maybe it needs to be higher or further to left. I keep thinking there should be more robots and more mechanical debris. I couldn't decide on a background and I don't know how to even make one so I just put the pink gradient and it looked ok. But I would prefer if it was more detailed like buildings or trees or something.

Or I thought it might be cool to have shenron in the background blurry with red eyes, but I couldn't find a way to make it look good.

The edges around the characters are rough. I'll fix all that stuff but before I do I want to fix the composition and background.