Actually I have just had a very quick play in PS and the problem is that your foreground is the same brightness as the sky, it should be 1 stop lower to look correct. Its also a tad over sharp which is making it look un-natural. If you can lower the brightness of the bottom slightly and then reduce the picture size before applying sharpening, you will get a great shot
You do realise that you cant enter this into this months competition now though as eveyone will know its your work
Its a shame as I am sure it would have done very well.
