Sorry for the strange title, I wasn't quite sure how to get the message across.
I've just received a mail asking for details/condition on how to obtain the publishing rights for one of my images that I currently have posted on Flickr. I've never had a request like this before, so I am not quite sure how to approach the subject. I've sold images directly via places like 500px in the past, but never via direct contact in this way. Apparently the image will be published in a collection intended for release in Germany and Italy at the start of 2016.
Does anyone have any advice on what the best course of action is here? Should I be asking for $$$, or is this the sort of thing where you should just be flattered by the idea and simply ask to be mentioned in the photo credits (and sent a copy of the publication)? I really have no idea how you would even price something like this!
I do have a Smugmug site, so I guess I could tell them to go there and buy it ... but because they approached me "in person", I feel like I should I should reciprocate.
Any advice is much appreciated,