Agree with both game on and off (always glass off) but also with supplying any pics/vids as requested by potential buyer. I show lights on to give buyer confidence game boots and display works. Displays are hard to get in a pic but I’ll have vids available of lamp and display tests. Off to show PF but i’ll focus on showing notable areas of wear like ball drops etc. Obviously more relevant to older games. I don’t think you need to upload a full library of pics on a fs ad. Show an appropriate amount to give a proper representation and be prepared to offer whatever is requested from a prospective buyer.
In my early days of collecting i bought a game off a Pinphila who i was meeting in Allentown. First game i was buying remote (tho was picking up eventually). A very nice OG BK. I received over 100 pics, showing anything that he, unsolicitedly) perceived as a flaw. When i got the game my expectations were exceeded as most smudges on the cab wiped off with a rag, or was a smaller issue than the closeup pic indicated. So i decided from this experience what kind of seller i wanted to be.