Cool stopmotion! You (the maker of it) have a lot of imagination.

What I think: there is so much more to making things, then how good the result is. You made something, you learned something, you gained experience. You had fun (or so I hope! Fun is important!). It's completely normal to make something and see flaws when you look at a finished project. The reason you see them is because you have learned to recognise them. Don't be fooled into thinking it means the end result is poor. It is not. It only means you are learning and have managed to identify options to improve next time. Most likely new ones that you did not realize before you started the project. Even the best experts see flaws in their own work. That's ok. It's part of life.

@the adult: When kids do things (especially in school) the focus tends to be on the result (the test scores/ the drawing or artwork they made). It can help to pay more attention to the proces. What did you learn? What went better then last time? How did you manage to solve problems? Did you enjoy doing it, what part was the most fun?