I do love art like this! If you have a link to information about this art showing that it is a permanent installation, you can put that in the supporting section. I like to submit with minimal acceptable text, then edit in more information from my contributions page at Niantic Wayfarer which I can do on my computer so I can use a keyboard to type in the information.
And as has been said, it is absolutely fine to just do a new nomination instead of appealing the rejected one. Since appeals are limited, I usually try to submit a couple of times before I use one. You can still appeal either of them if the new one is also rejected. (I don’t resubmit with the same photo, though.)