I, too, list items with flaws (almost always aesthetic).

This is what I do:

1. Put it in item title (eg: "[Item Name] - Minor Damage").

2. Put it in the description, with as much detail as possible. Eg: "there is a scratch on the upper left hand side of the cover, measuring approximately 4 cm. This does not affect any other part of the book, including the pages. Please refer to the second photo."

3. Put a clear photograph of the damage. I usually put a close-up, and/or a photo of the entire item with the fault circled in red.

4. I lower the price by however much I think is reasonable, and put something in the description to the effect of, "the item has been discounted accordingly" (because usually, I have undamaged stock of the same item). If the item is a once of, you could always put something like, "this scratch has been taken into account when pricing this item".

I've never had a neutral or a negative, and I've sold literally thousands of flawed items.

If I ever get a grey or a red, I'd reply with something like, "This flaw was detailed in the item title and description, and the price was discounted". Anyone can click on the item and see for themselves, so the buyer would look unreasonable, not me.

Most of my less-than-enthusiastic feedback is about sizing. I put exact dimensions in all of my descriptions, and I also use words like "mini" (if something is a miniature version of another item). Despite this, I've still had comments like, "Good item but really small" (even though being small is the whole point of a "mini" version of something ....).

Don't worry about this too much, Melina. If you're describing clearly and accurately, that's the best you can do.