I just chose a couple of examples and commented on them. In general there is nothign to say that is wrong with them, but there are things I have suggested to make them better. Mostly shoot upwards for wide angle
and try moving the strobe for different lighting on macro
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shoot upwards more .. get more blue variation into the sea tone. And look for seascapes like this that either emphasise the dramatic wall (not hard to find at babylon) or have a bit more colour, something more than just the gorgonian.
But shoot more upwards is the key, sometimes you will feel stupid at how upwards you are shooting, try to get some sun in there !
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Nice crisp image, nothign wrong with it, maybe a little closer would be nice. Try moving your one strobe around to create different lighting effects, Alex will testify to me loving the one strobe !
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I have never tried black and white jellies .. but i love that shot, it has beautiful grey tones .. was this done in camera or made black and white afterwards ?

great snap i know how hard these guys can be to get, shame that the focus is on the green algae leafey things.
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again shoot upwards and try to get the entire subject in it will look more pleasing to the eye.