I forget if I can submit it again with a better title and pictures. Are there changes I could make that would help it to be acceptable?
You could definitely submit it again, though I’ve definitely had less luck with hung paintings in reviews than murals (on grounds of permanence). Adding information about the artist would definitely help, and I might not include about people “communicating on their phones”, as that’s not relevant to the painting.
If i were you, i would instead submit the Planet Fitness next door and be sure to place the pin at the front door. Not only is the object you’ve submitted here probably not going to be accepted, but its location doesn’t meet inclusion criteria to become a pokestop. (It could possibly become a power spot, i can’t tell with enough precision.)
If the Just Fun Adventure Park is still open, you could also submit that and place the pin at the front door. But i can’t tell from Google Maps if that business is still open.