#1 Horizons tilted and the foreground is underexposed. These thought are a very easy fix in post. All you need is a Levels adjustment layer to bring up the foreground brightness. I'd also crop tighter. There's a lot extra room on the left that can be done without.
#2 Obviously the sunrise and weather are great here. But the interesting part of the image makes up so little of the frame. I want to see how the city, sun and rain play together. I don't need to see all those clouds at the top of the frame and some random back water ways of southern Florida.
#3 Technically this seems pretty good, especially for being handheld. The clouds bother me, mainly because they only are in half the frame. The image feels unbalanced this way. This image could also have benefited from being taken in that little bit of time after sunset when there's still some color in the sky.
Overall thought, good start. Keep shooting and keep learning.