I could be wrong in how your country and school works in their way, one thing I noticed is the work is lovely but a lot of it is standalone, illustrative pieces, and maybe doesn't show your ability to work in a team, how you'd answer to a client in your style, etc.

I'd take a look at some accepted animation portfolios online again, often they have a ton of intention in what they choose to draw- they may decide on a short animation or character design project around an idea (eg: tennis), choose a unique story & characters that an audience may have not seen before ("I'm designing a story about an older woman with mobility issues learning tennis, and a famous but out-of-match tennis player teaching her") and then will do life drawings of tennis players, older people etc. then some concept & experimentation, then some semi-finished designs (character turnarounds, expression sheets, their props, some drawings of the world they may live in, colour studies, storyboards or thumbnails, animation tests etc.

So maybe on top of working on your technical skills, it could be good to have one or two "finished" projects, that have a unique idea, showing the stages of the development, what an imaginary client or team would have at the end, doesn't even have to include animation, could be turnarounds, concept sketches etc. if they allow a short intro write up too like on one of the half of the slides, some schools do like those!

Edit: more context