From this picture, which isn’t great, can anybody tell what kind of hawk this is?

I am going to make a guess that it is a juvenile Cooper's hawk but it is just that, WAG!

What I can find, from the research I’ve done, is that it is probably a juvenile Cooper’s or a Sharp-shinned hawk.

Coopers or sharp shinned hawk. They are hard to tell apart even with clear pictures. The Red-shouldered hawks also have rufous colored breasts. Light color under the beak rules out red-shouldered hawk.

I think that's a good WAG

It’s a dark phase of some hawk, I don’t think it’s an acipiter, (coopers or sharp shin) my guess is red tailed or red shouldered, unless you have Swainsons there then a third option

Here’s a Swainson’s dark phase