|Only a judge can really make a definitive ruling on fair use. Speaking to the law, I'm afraid, is out of my jurisdiction.
Here's how reusing images goes: No one notices. It's poorly policed. Possibly a DMCA request if someone did. Haven't seen one ever. But that doesn't mean we shouldn't do our best. As a site of authors, we don't want to be willy nilly taking and reusing work from another author or company.
Since I can't give you blanket permission, can you just tell me what image you want to use?