I like to see a pic of the horse standing on solid ground for a conformation pic and I get agitated when people tilt the camera to make the horse look more uphill. Put the bloodlines in the video - sire and sire’s dam and sire, dam and dam’s sire and dam. I hate when people only list the sire and the dam’s sire.
I prefer an unedited view of the horse working - w, t and canter with minimal editing. I HATE slow motion shots. Add movements from of a test the horse is supposedly schooling and supposedly solid at. Personally, I would rather see a slightly longer video than a shorter one. So do most trainers I know. Short ones often hide bad transitions/bad behavior/bad whatever and everyone can skip through a longer video. Short videos often waste peoples’ time UNLESS they are coming from a reputable trainer. I would want to see a longer video for any horse of interest.
I really don’t care that much about the quality of the video as long as we can see what we need to see. I’d rather not have the price of the video tacked on to the sale cost.