1 do we have the right to this asset, in writing2 does it show a client logo, and if so is the relationship accurately described3 could this frame imply a partnership that does not exist4 is any text baked into the image still trueQuestion three is the one that catches people. A logo strip above a pricing block looks like proof to a reader and reads as a claim to the company whose logo it is.
Our own rule on this is deliberately strict. Three images in our library match fallback covers used for NDA cases on the site. We use them as generic brand visuals and never as client proof, and that exception is written down precisely so nobody rediscovers it later and assumes otherwise.
The general principle: an image makes claims that a caption cannot retract.
A disclaimer under a picture does not undo the impression the picture made in half a second, which is exactly as long as anyone spent forming it.