It looks nice, clean and orderly, but it looks like a quiet place, like it's never visited. So what I suggest is make it a little more messy, not messy in the style of a full floor, but perhaps an ad stand or something (visual) which gives random messages.

Perhaps a hip poster on the wall? Or even better... A Slogan! Like:

Gotta catch 'em all, with this new Pokéball! for example.

Of course, it shouldn't become a maze, so just the ad stand on the floor or something, and the Slogan on the wall next to the cashier thingy.

The flowers should be swapped with something else however, like a box of pokeballs.

It looks nice btw!

Good luck!