Thanks for the faith in me Ben. I've been around photography and copyright issues for a very, very long time, so I do have some understanding of copyright law, but there are still some grey areas in my knowledge base.
It depends on 2 main issues: 1) What use has the owner of the image allowed, i.e. what license(s) is applied to it? e.g. is it 'creative commons', 'attribution, no derivatives/non-commercial', or 'public domain', etc? If so you're probably OK to share it.
Also, 2) If it's on a social media platform that typically allows and encourages sharing (Facebook, X, Instagram, etc) then the author would probably have to accept that sharing is expected.
If I allow sharing of my images, I put my copyright notice on them and make sure they can be viewed and shared but not printed. So, what format is this image in and is it copyrighted?
A much simpler approach is to have the author or their agent (in this case Ryan) let you know at the start if it can be used.
ALSO, do not assume that you have copyright of an image if you buy it. That is usually NOT the case, you only get a license to use it (and where and how depends on the license).
You only get copyright of an image if 1) you made it or 2) you bought the copyright (not the same as a license to use it.) Copyright buyout of images can run into 5 figure sums, depending on the image.
In summary: It depends, and there's no easy answer. :(