The photos are dreadful! The video, I liked her attitude but she moved like she is sore. With time and training she might be a good foxhunter because brain and attitude are essential in the field.
Ditto the others - her front legs are nice and that’s pretty much all anyone can judge with any reasonable confidence, and as is soooooo common, her feet are horrid 
If you want to see what good videos and conformation shots are (well, most of them), check out the online catalogs for some of the big sales. Ocala Breeders Sales (OBS) just concluded 2 sales, one in March and one last week. Not every horse for sale has photos and video but many do.
You can learn what is ‘standard’ for photos and videos. Videos are at a walk, side, coming and going. No prancing around loose. 
Many of the OBS horses also included ‘under tack’ videos which is the horse going usually 2f timed. (not as critical for most riding horses ).
Other places to look for photos and videos… Keeneland sales and Fasig-Tipon sales.
The conformation shots can help develop your eye for what to look for and what you like.
I would also agree with what others said about Please Be Quick. The video she looks nicer than what the conformation shots appeared. As others have noted, flat, solid footing and positioned correctly (both the horse and the photographer). I also thought her toes were a bit long and that can often be common of TBs on the track. She did seem to have a nice temperament trotting and cantering without getting her brain in a twist.
She has some decent breeding a few generations back. I would agree, maybe her times breezing were not stellar but you aren’t looking for a race horse. I do have a soft spot for the chestnut mares 
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I think she looks alright from what I can tell, but I don’t like her movement behind. She looks pretty off tracking left. And hops behind in canter and moves quite narrow. I’d want to see her after she’s let down.
I didn’t notice the video until you responded so I went and looked at it. I agree in that video she looks off tracking left - and I noted the narrow movement and hopping. But it could be just a young, squirrely horse being chased around that made her move like this; it definitely wasn’t relaxed or purposeful forward movement so it is hard to know.
I mentioned dog showing above; I have actually edited videos of my own dog to demonstrate how moving at the wrong speed, or taking a photo at the wrong time can make them look like they have conformational flaws. If I was really good at it, I would change the markings and ask people to judge the dogs - not realizing that they are actually the same dog. The difference good handling makes is astonishing sometimes. I am sure it’s the same with presenting a horse.
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Based off the video I would proceed further.
