Nice DOF shot. The only thing I might have done differently; crop the bottom a bit tighter.The lower left corner is a bit distracting to me. If you cropped above that and used partial orange and yellow gears, it might shift even more focus onto the green one.
I actually like the blur here. It is a good example of soft focus. It is difficult for me to see what is IN focus, though. Nice composition and colors.
Interesting use of shapes, colors and diffused lighting...but I really don't see anything in focus here. I suppose the Lime colored gear is what the focal point is but it still look a little soft. I still find this to be one of the more interesting photos of this challenge though.