I don't see how this uses shutter-speed in a creative or interesting way. It's a very nice photograph, but I don't think you can get away with submitting it for a challenge that has nothing to do with it.
6 - Good idea/concept, if original then well done. Criticism; obviously more definition in the strings. I like the crop and angle, perhaps slightly different lighting, seems a little 'yellow', but maybe that's what you were going for.
The motion of your string is going up/down. The view of the guitar is left right. I find that distracts from my perception of the motion of your strings, which is what I think you intended.
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