The materials are too high-quality and too well-designed for what would realistically be in that setting.
That’s exactly what I was trying to say, but said so much more succinctly!
Maybe the issue is that there is nothing to concretely establish a sense of scale, since none of the figures have human features. Another issue is probably the frame rate of the video this still was taken from, since the cloaks have no motion blur and thus look motionless and staged.
That’s an excellent point about the lack of motion blur. I also thin the shallow depth of field is a major player.