Justin Descallar has submitted this image taken with a film based Nikon FE, no other information available. The vertical crop was a good choice as the bubbles are all moving upwardly. The top section is wasted space and the bubbles are not immediately visible so consider cropping it tighter across the top. The three bubbles that are in focus are nicely spaced apart. The most intriguing one is the one in the bottom of the frame, that gives a nice reflection of the scene behind the photographer. Using a shallow depth of field the background has been nicely blurred to give a colorful but not terribly distracting backdrop for the bubbles.