Ze,
Convincing a fish to pose is difficult. Those were better pics of fish than I have ever gotten, so nice job. Eels and turtles sometimes make better subjects, they don't have the mobility of most fish.
It could have been dehydration, or it could have been the high you get from breathing compressed air for an hour. Might have been a little hyper-ventilating as well. Or just the adenaline.
You are hooked, no going back now.
On to bigger and better dives.
And wow, that is a good dive off of one tank for a beginner. I assume you were on scuba and not one of those hose jobs?