I have to say I prefer the originals. The first is ok if a bit Bay-esque. In the second the overexposure of the wall on the right takes all the focus off sintel and takes all of the interesting colour out of the scene. As for the third, that over-done blue-ness looks like the sort of thing a colourist would be trying to remove, not add.
… Sorry, that came out rather negative. I do like that the first has some more contrast, and it’s always good to see someone else’s take on something.