First: I do feel like he misses something near the shore.First: Either put some details near shore or replace it with sand. It looks off.
Second: Stone floor lacks details. Or maybe make this "mountain corridor" smaller.
Third: Meh... Just delete it. It looks like shit.
Fourth: Like this one.
Second: I don't think it lacks anything, it feels very well balanced. Not every 3x3 tiles need an insane amount of details.
Third: Very mature, good job on growing up kid
Fourth: You meant to say: I like this one.