Cris,
Welcome to the wonderful world of UW Photography. I'm starting back in my self.
Pretty dang decent shot for the first try underwater. Much better than my first tries back in the bad old film days.
You have embedded your copyright info. Hopefully you've also included in the JPG info as well. That's always a smart thing. Good habit to get into and it should be on every image. The only time you shouldn't have it, is if you've sold rights to use it, and even then you should have it in the JPG/TIFF/RAW info.
A "water mark" would be right through the center of the image intended to make the image useless to anyone who would like to steal it. I agree water mark is over kill, but copyright info should be there.