Kind of speculative reconstruction of the Chinese stegosaur Chungkingosaurus jiangbeiensis
. This is one of the smallest stegosaurs known to date. Here, it's performing some weird moves, probably as part of mating dance or something (funny how almost everything strange that a dinosaur is depicted doing can be explained with sexual display. Gotta love nature!).
This time I didn't use as high quality references as I like to use, so there could be many things that may be off in this reconstruction.
Reference: [link] [link] [link]