I would like to recommend the short film "Meet Meline".
It is about a girl Meline whose curiosity is piqued when she encounters a mysterious animal while playing in a barn. The film is beautifully made; the animation is smooth and lighting is great, and it is even more amazing that it is made by just two creators without a budget.
The making-of makes for good reference for anyone, especially amateurs, who would like to make their own short film.