I didn’t vote in the Bubble Challenge so this is the first time I’ve looked at your image. My first impressions are that the big bubble is so overpowering due to being out of focus that the visual effect of the light reflecting off the small bubble gets lost. What I would suggest is that you crop the image almost in half to remove the left half of the big bubble (Which is primarily negative space) including the bright spot at the top of the bubble. This would help feature the small bubble more and the big bubble would provide a dramatic line through the image from the bottom left corner to the upper right corner. I think the colors and saturation are well done in this image and you might have made to 6 with a different crop.
Feel free to PM me if you have any questions regarding this critique.
Very nice photograph. The twinkle of light on the sides of the smaller bubble are absolutely perfect. The colors on the edges of the outer bubble are great too, and the focus (and lack thereof) are perfectly executed. Great photograph.
Excellent capture to create a wonderful composition! The focus seems on, but I would add a touch of sharpening to the image to draw the eye onto the smaller bubble quicker. Great colors in the background bubble!