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A broken seashell feels so insignificant but you wove it into an entire story, I really like it!
I like the last line, it lets the readers ruminate on what Mom has said. Even though a sea shell is so small, it has still made it's impact.
Overall, I think it's pretty good for a short story! I'd suggest you add a little bit more detail to how the cut felt. Did it sting? Did it make your characters blink tears? I think that would help emphasize your point a bit more.
If you want to make this into a longer story, I suggest adding more detail to what the shell looked like. What color was it? What shape was it? How did it feel in your hand?
Overall, I liked your story, nice job!