It's not an exceptional shot, as it's blurry and the features are hard to distinguish. But underwater photography is hard, and I'm assuming that using jellyfish as a subject makes it even harder, so kudos for that! The composition is good as well, but again, it is quite blurry.
I grew up near a jellyfish coast and I know they are to be avoided! This pic screams "Beware!" to me. Yeah, it's blurry. But it's also Real Life. And where else would you have a chance to see such detail on a pic that will cover your monitor screen? Side benefit...the colors and the centering of this pic make it a very nice desktop.