Not bad for an early outing! Lots to be happy about.
You don't say how you are controlling your strobes - manual or TTL? That will make a big difference in the advice people offer.
Your macro shots are pretty good. They do have a sort of "floodlit" look to them though, I'd suggest trying to use the edges of your strobe lights or even turn one off (or way down) some of the time to add more shadow textures and dimensionality.
For the WA shots, first you need to expose for ambient light, then use the strobes to highlight part of the scene. Your first example is a good one, but (assuming the original was shot as a vertical) it looks like the bottom strobe was much closer to the reef than was the top strobe. It's very easy to make this mistake when shooting upward toward the surface. The strobes should be in a plane parallel to the subject you are lighting - in this case pull the bottom one back and push the top one forward. Unless the strobes are evenly distanced from the subject, this is what happens. I have many such examples myself!
The other two WA shots look like you were just too far away. There is some illumination at the bottom but little to none at the top. Light falls off very quickly underwater. Also, if you're using TTL, it is very hard to get right for these kind of shots, and you're better off going manual.
I'd recommend Alex Mustard's recent book, as its the most user-friendly explanation I have found for strobe placement. Martin Edge's book is also very good. Here are a few other web resources:
- cjames likes this