HELP! I am making a graffiti what do I add?

So, it looks like you're doing a graffiti about tennis.
The background could be a tennis court floor and there could be some tennis rackets. I like the colors, so the background tennis court could be a deep blue and the rackets could be a neon pink.
Keep up the good work!
I think it looks awesome as is, but maybe an idea is a shadow of a person swinging a tennis racket!