Yes, there are more photos. Here are a couple of close-up images. I have also looked at them from the Dateline episode.
2) Most of the prints are heading in or are sideways. None are heading out of the bathroom. You can also see some that are just the toes and a group where they are all overlapped (appears to me that someone was holding her and making those prints).
3) There is some blood right outside the bathroom on the carpeting but there is not a trail of CY's prints leading to the bathroom and that is why there is speculation that she was carried to the bathroom. If I have time, I will find it. I am pretty sure Klinkosum discussed this during closing arguments, possibly in the 1st trial. Also, when the video is shown at trial of the house, the investigator never points the camera toward the floor to show a trail of footprints. There wasn't a trail. There are photos of the area of the bedroom floor where you can see the purple chemical that makes blood appear and you can see some random large prints on the floor but not a trail of CY's prints.
4) Yes, evidence contradicts it as "all over the house" would include the downstairs, right? There aren't any bloody prints down there. They were limited to the area near the body (the two different shoes prints), some small ones on the carpet in JY's closet and then the very dark ones on the bathroom tile.