I think the composition overall. The advice from everyone helped me focus this to tell the story, although I did get the angle of one of the figures a bit wrong when I put everything together. But I don't think people will notice. Some of the animations could be improved but overall I am happy with this as a first major conversion effort.
My use of acrylics is improving, although I still have a tendency to highlight/shade everything without paying enough attention to how the light is falling on the figures, especially when they are all in the final vignette. Like they say, every day is a school day....