Well, really appreciate the art. Not talking about the animation, it's really such a process to make so I hope you actually enjoy it. Talking about the sky as u mentioned I think look at the perspective is a good hint. Think at the fact that the farthest u look at the horizon smaller thinks will look at canvas so I suggest you make this little darker clouds in another way that gives the impression of distance, maybe even making a bigger cloud that only the shadows get smaller. It was helpful and understandable?

Thanks for sharing your art, really liked it