I love your not so traditional camera angles! They make you think of what you're actually are seeing!
You also have a feel for perspective, that's also good. Personally I like 2nd person, especially when recording swimming video's.
And your lighting is good as well.
The first picture I find the least interesting, because it's framed in sort of in between focus points. Apart of the ladder which is distracting, the diver is just a bit too far away, and his shadow -which could be interesting- regretfully isn't in full view. The light is a bit weak, maybe a bigger angle lens and more sun you would have more definition, sun rays, shadows, depth.
In the last photo the bubble ring is cool because of light and contrast, but the pool lines are again distracting. Again with a bigger angle lens you could be closer up and have a bit more face.
The second photo, diver with sun through windows in background, is great, could be a bit better when the diver wasn't cut of, and totally floating in frame. Again a bigger angle lens would have helped in this case where I think you couldn't have more distance.
The 3rd is nice because of the perspective angle and in a lesser way, light.
The 4th has a cool angle, and the reflection in the mask is cool.
Ok, that's it for now, I now need to eat!
Go on, you've got a feel for it!
Love, Courage and water,
Kars