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I like the improvement, the building already pops out much better, but I think it would look better and more natural if you would have chosen a sky image that has those necessary qualities on its own instead of just vignetting the last image. Now it seems that there is too much blue air space above the building. Try experimenting with different kinds of sky images that have a more interesting hue variation. The tree in the right side of the building does not look right. It seems that it is illuminated from above by the sun but that doesn't work quite good in a night shot, does it? Try to darken the upper part of the tree so only the lower part would seem to be illuminated by the street lights and give a blue tint to the darker parts, because that's the kind of light that is coming from the sky.