Nice... I think the sky gives a little more dimension to the shot. I see what you're saying and I might have added a subtle vignette or done a gradient filter.
Love it Tina, what a lovely pose
Like the skyline, gives depth to the picture
cool dog! i wouldn't crop the top off, i feel it adds a bit of airyness to the image, if that makes any sense to you at all!?
I agree with both Gremlin and Sparkoss on the sky, it's fine.
You could crop 2cm off the bottom though - Scroll crop to see whether you like the effect.