it's beautiful.
I don't know why you didn't like the effect of water but I did. can be improved, yes. but it's beautiful Maybe because you used a single shade of blue, maybe practicing with all of them light, sky blue, turquoise blue, yellow tones if there is sun, black tones and white points if it is night and there are stars. the diversity of colors gives realism.
RE: The Shape of Water - Illustration and Process