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Thank You

It's the reflection in the bubble that is of real interest. I would suggest cropping out the white highlight right of the backround, its distracting.

Let the bubble fill about two thirds of the frame positioned to the left.

The bubble needs to be large enough in the frame to really see the details because the reflection in the bubble looks like a fantastic fisheye shot.

I couldn't agree more. The reflection is awesome, it's a step up from your normal reflection in water as it swirls inside the sphere. Great shot.