General impression is that this is a well-drawn comic, and the plot is easy enough to follow, but there are some things that bug me about the panelling.
Something that hits me as immediately bit unintuitive is that the comic tells me it reads right to left... and then follows that with a sequence of panels where the protagonist and point-of-view character is consistently walking from left to right, over the course of the rest of the first episode, which encourages the reader's eyes to follow her moving from left to right.
The only time I think people should draw comics right-to-left is if they've been raised in a culture that writes and draws right-to-left to the point that their natural instinct is to draw and write comics right-to-left and it feels awkward to flip it, especially if the comic was originally in a language like Japanese... but these panels the composition naturally flows left-to-right. It feels like you naturally draw your panels to read left-to-right so... just have your comic read left-to-right, which more people are comfortable with on this platform.
The panels are generally well-drawn, but it feels like some panels are drawn based on what's more impressive-looking to draw, not what clearly tells the story.
When I first read this sequence (and again, he's consistently looking off to the right, so I have to fight against his gaze drawing my eyes to the right to read these panels to the left), I couldn't work out why there were two almost identical panels of him crying. It was only after scrutinising the panel I saw the droplet on the ground, which was probably the point. I feel like small panel showing just a close-up of a teardrop hitting the ground rather than the full figure would have been clearer. in getting across that his tears are the focal point.
I'm not sure recapping the same panels at the start of an episode like in the third part is necessary on a comic this short. It's not bad practice on longer long-scroll comics with spaced-out update schedules, but there isn't that much info to recap here. An establishing shot of her sitting bald-headed in her room would have been enough to re-establish where we were at.
The story and stuff was fine, but a little dull. There wasn't really a twist or a surprise. When you tell the story in text it becomes:
"One day a girl was walking through school having a pretty normal day. She walked out into the yard and saw a boy listening to music, and he started crying. Where his tears fell, flowers bloomed. He smiled at her and pointed to the sun, then gave her one of the flowers and walked away. When the girl got home from school, she removed her wig, false eyelashes and false teeth, and looked sadly at the sun... Suddenly! She grew hair, teeth and eyelashes! She knew it must be the work of the magic boy and his flower."
I feel like this story is kind of trying to both do too much and too little. There's a lot that needs to establish that doesn't exactly come across about the boy, like... when he pointed at the sun, I didn't really get what he was trying to tell her. Is he from the sun? Why was he crying? How did he know she was ill? Why was she walking to the yard? But then it also lacks a message or twist. The girl wanted her illness to be cured, she did absolutely nothing, just hung out with this guy for a few minutes, and it was cured by magic. It makes sense in terms that I could follow mostly what happened, but it lacks a point; it's not really saying anything about having an illness that affects your appearance, or about showing kindness, because nothing really cost anyone anything here, and the negative effects of the girl's illness aren't visible at all; she looks perfectly healthy, can walk etc.
So as general advice for future stuff...
- Just make your comics left-to-right, your instincts are clearly to draw compositions that read that way. Being right-to-left isn't what makes manga manga, it's about style, theme and pacing, and you have all those things, so make your manga left-to-right so it's easier for your audience.
- When you make a short comic, try to focus on a simple, strong message about people or the world or something. It can be a positive message, but you sometimes need to show more of the problems the character/s face to make a happy resolution to those problems feel earned.
It wasn't bad on a fundamental level though. Please know that if I'm critiquing things like your panelling and story themes, it means the drawing is generally solid and I could follow what the story was, which is a sign you did well! Keep it up! 
