Nice!
I've got to be twice your age before taking photographs as good as yours! Some thoughts:
Try leaving off your orange filter when using the strobe, then look at the difference in the colours, you might prefer it.
The hardest lesson that I have learned is not to dive and expect to be able to shoot anything that turns up. The best images are taken when you have a particular subject in mind and set up your camera to deal with that subject. SLR photographers pick a lens for the job, then strobes, filters or whatever. Sometimes you get it wrong! But images of the same subject are different when taken with different equipment:
Strobe, 60mm macro lens

Strobe, 12-24mm wide-angle zoom

Strobe, fisheye lens

Magic filter, fisheye lens

Four separate dives, same fish, same site (Ras Mohammed, if you can't guess).
Tim
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