The first one had some decent animation concept was alright I guess - a little creepy. There was a little bit of sexual appeal in some of the shots of the girl, and I thought that was good. The various perspectives the animator added a lot of interest to the animation. I did not like the side view of the girl's face, which gave her the impression of a gorilla
Second person's style looks really bad - I guess it was supposed to look misshapen and eerie (like salad fingers) but it just made the animator look inexperienced and lazy - Every animation needs some aesthetic, and there wasn't enough in the second animation for me to enjoy it. The slenderman-looking gentleman looked pretty creepy (the pinky was a bad decision , it gave me the impression that he was "upping the horns" and destroyed a lot of the creepiness that would have otherwise been present in the scene) and I liked the tone shift when he appeared. I enjoyed the second animator's concept the most out of anything in this collection of animations.
Third animation was stupid and destroyed the mood set by the previous animations. Some possible reasons for this - The character looked comical (not scary in any way), and the song didn't fit with the mood I expected from this animation (particularly the singers voice and the beat)
Third animator also gave the lazy impression - The animation was pretty much 3 panning still frames with some little part of it moving.
I enjoyed this to an extent. I feel like the authors could do much better.