What Munboy said. Your best bet is to look at the top 100 for Urban Fantasy. In most cases, the household names and other traditionally published authors are relying on different marketing, budgets, and distribution than indies, some of which isn't applicable to us (price points alone often mean we're attracting different audience segments). So filter those out and see what the top indies are doing. Most of them are relying primarily on pleasing a voracious, budget-conscious Amazon audience, which is likely to be your audience too. If you see books that don't fit (for example RH books when your book isn't RH), again, filter those out. Look at the covers appealing to the same readership you're hoping to attract.
In most cases with urban fantasy covers, with or without romantic elements, that'll mean covers with attractive, tough-looking people, and some visual indicator of magic.