Really cool how you had a super big range of background characters. I like when artists don't confine themselves and explore different ideas in one piece. I got some Luca vibes from the setting, for sure. One detail I loved was the shoes falling out of frame and then popping back up when the kid started swimming to the surface. It's such a tiny thing that I wouldn't have noticed, had you had left it out, but because you didn't, it added a wonderful sense of continuity.
Great work!