I would have no idea that those were eviction notices, or that this was even under a bridge, if your text did not accompany the photo.
To me it looks like a concrete wall, presumably of a building. And the clean, litter-free ground in front of the wall makes me think of a well-kept area, possibly new construction in a trendy suburb, with permits or building specs affixed to the wall. . It certainly doesn't look like an urban area where vagrants and homeless folks gather.
I think some "supporting elements" would be useful in conveying your message to your viewership. . But if these supporting elements are not there, then you don't want to "fake it" by importing cardboard boxes, rubbish, etc.
It's just one of those areas that doesn't look at all like what it really is, so it'd be really difficult to convey thoughts and feelings about homeless people strictly via visual imagery - and even more difficult through a single still photo. . A series, perhaps, shot over time, may do a great job of communicating what you want to communicate, especially if it shows frames from days/weeks prior, with homeless folks camping out there. . And if presented as a series, a close-up of one of the notices would make it clear to the viewer that they are eviction notices, and not building permit postings.
So, no matter what angle you shoot it from, I don't think it conveys what you want it to convey, because the supporting content just wasn't there at the time you shot it.