Jurassic Park Mutualism

Had the idea after remembering crocodiles and birds do this. Obviously, this kind of a picture has been done before with a T. Rex and some small pterosaurs or theropods. But I wanted in JP/JW style, so I went with the Spinosaurus (cause it was related to crocodile), Compsognathus, and Microceratus. If you're wondering what the Microceratus were doing, they're cleaning up the algae. I also wanted to show the Spino using its sail to regulate his body temperature, like it was suggested. So the Spino was laying in the middle of the sun, absorbing it, and using it during the night time when it was cold, and vice versa. Not sure that's how it works, but I thought it's a cool idea. Sketch done manually.
Main reference: https://gulfseafoodnews.com/wp-content/uploads/2012/12/american_alligator.jpg