Do you use any filters for your camera?
The second looks like a Natural Density filter (?) (aargh, all experts might want to flame me now?) could have made the colours come out even more.
(I would have suggested tweaking the curves in Photoshop just a tad, but you don't use Photoshop, you said earlier on, so...)
Not resized enough, I'm afraid. You must have a very good computer screen at home ... but some have lower resolution screens and have to scroll to see all of your photo, and that is no fun.