This photo looks artistic! And I want to comment with Yann's comment. The reason why the buble is quite blurry it's because when you focus the lens on it, the lens is confused and 'couldn't adjust where to focus because the lens sees it as a flat object and the way I see it on the photo, the camera was focused on the center that's why it didn't became that clear as aimed. But if the lens was tried to focus on the edge of the bubble (between the bubble and the background) then pressed the shutter release button halfway to lock the focus, in this way the lens won't get confused anymore where to focus because the lens can see the difference between the subject and the background. Then when it's focused keep hold the shutter and move from the original position or on the center as you recompose the shot. And finally press the shutter all the way down to take the picture. 'Hope this explains. :o) happy shooting to all! :o)
