Hi Donna,
Do you have Lightroom? If so, for nos. 1 & 2, you could use the graduated filter to under expose the sky and hopefully give a little more colour/detail. I think this would make 2 good shots into great ones.
No. 3 is lovely and as has been said, shame the person is very dark.
No. 4 doesn't impress as much as the first 3.
Thanks for the comments guys. I know No.4 is the weakest, it was touch and go whether I posted it at all.
Yes I have got LR but the LR results compared to these (Nikon Capture NX2) were pretty naff.
all great shots what filters are you using ?
Did you crop something out though?