Done a fair amount of selling on ebay. Always use better than avg pics/scans.
Used to consistently provide specific grade or range. I've only been on the boards less than a year but I've read this same basic thread a few times now, and it sunk in. It seems 'best practices' might include a specific grade, but common practice is just as often to cop out and skip the specifics. Seeing lots of sellers do quite well without the specifics, I've gotten a bit lazier, and last round of about 80 auctions used generic "low end GD" or "top end of the FN range."
In retrospect, the biggest book I sold was the only return I got. A Strange Tales 110 that I specifically described twice as "high end GD" was returned because the buyer and his local comic store agreed it was not a VG or VG-. In my mind I said wtf? but I refunded quickly without event, I didn't want the 880 that badly and the board later agreed in PGM it was 2.5 range, so live and learn. If I had do over would probably say "2.5" but who can say whether the time-wasting gambler in question would've done same thing anyway?
[yes, my first reply to him was "yes, I know it's not a low VG that's why I only called it a really nice GD" but I cooled down quickly since my policy is no questions asked anyway. So now I'm back to two copies and waiting for the next time there's a new Dr S. movie out.]