A very beautiful image, that definitely demonstrates a shallow DOF.
The composition is well thought out. Exposure and white balance seem perfect. Not sure if you had to do much PP, but it sure does not seem like it. This was an excellent entry in my mind.
6 - Very nice. Nice colors and seemingly good contrast/whites control. Criticism; not much other than perhaps overall (and could just be this size) seems slightly 'dark', but any tweaking would be near impossible I imagine with the contrast/brightness/etc, so not sure. Like the choice of crop and the 'DOF' used in 'synch' in the background. Perhaps this at 640 height too, 'somehow' compositionally, may have also given it more punch, who knows.