ya know what i think might help for scale? one of those flat-yet-curved bars with the holes they use for stop signs or no parking signs.... you could place it on the sidewalk near the yellow painted part of the curb, cause hey... ya can't park there!

i know you're supposed to have just an abandoned thing, really, but have you given any thought to placing a bunch of trash bags/cans around it as well? nothing's abandoned more often than trash!

(would actually look like a scene from the streets of NYC!)