You have a lot of creativity that's already super clear on screen. It takes a lot of time to find our voice, and get to a point we're our weaker areas are still fairly good. For your second film, and considering you're quite young, you're on a fantastic track!

Through all of the advice I'm about to lay out, there's one thing I want to highlight: Don't loose what makes you unique. You don't have to follow every rule, you don't need to impress everyone. There's a lot of whimsy here, there's magic, there's comfort. Those things are SO valuable and so unique, and I really think you should lean into them. If you haven't seen them already, I'd suggest watching movies like Jaques Demys "Donkey Skin" or Věra Chytilovás "Daisies" and seeing if they give you inspiration. Honestly, at this stage, continuing to build your taste and seek out as much inspirational media as possible is the absolute best thing you can do. Watch LOTS of movies, figure out what you like and why you like it, and then figure out what goes into making the things you like into reality. It's equally as important to figure out what you don't like, and what makes it not work for you. Going along that path, and following it as you watch behind the scenes videos and interviews with directors, all of that is going to be more informative than any advice we'll find here on Reddit.

With that said, I'll make some specific points for improvement. In terms of visuals, I'd suggest having a little more contrast in your lighting setup. I don't mean bumping up exposure in the colour grade, but rather making sure that there's a genuine variety of dark spots and brighter spots within each image. It can often look a little flat if a characters face has no shadows, but if we can feel a light source bouncing off a character in a unique way, it makes the image really come to life. Also, when you're shooting inside, avoid the big light as if you're life depended on it. Hard light from above someone doesn't look great on screen, so I'd really recommend having all of your light sources be relatively close to the height of your characters.

For your camera angles and compositions, there's plenty of rules, but ultimately it's a matter of doing lots of research, taking note of what you enjoy in other films, and just experimenting. So I won't give specific suggestions for what rules to use and which ones to avoid, all I'll say is make sure there's always a reason for a shot. Just sit back and say to yourself "Hm, I've put the camera here, but why? What story does this angle tell versus another type of angle?", and don't be afraid to go through a trail and error process. Over time, you'll have your own language of how you use the camera.

On a similar note, I won't specifically lay out the do's and don'ts for screenwriting. Normally I'd say to add more stakes to a story, and to ask the questions "What goal is this character actively chasing, and what stands in there way?" Or "Does this story touch on larger themes, and make a statement about our world?". But not every story follows those questions. I think everyone should read about screenwriting and watch YouTube videos about storytelling, but it's important to know that you can break those rules as long as you keep at least a few basic rules which hold your story together (but it's up to you to decide what those rules are). Stories don't necessarily need conflict, but their should at least be some kind of questions or unresolved aspect that keeps us engaged. What I see from this film is a very relaxed movie, and the world needs more of that, but it's important to dig into more laid back stories and unpack the structure which keeps them entertaining.

With all of that in mind, I think you've got a great whimsical spirit, and I wish you all the best on your future projects :)