Have you worked with blogs before, for tours and such? I'd start by asking those blogs if they'd like to do a cover reveal for your latest. Just shoot off a couple of emails, basically. Or check their blogs to see if they have a request form.
I actually just coordinated a reveal with three blogs...but I've interacted with all of them before. One is a blog I guest post to every month, the other two really like my work, so when I mentioned on social media that I needed to set up a reveal, they jumped on it.
Generally, blogs want some other content (other than the cover and blurb), like a snippet or a giveaway.