Wow, picture 6 is really amazing, great colors! Some of your pictures dont seem to be completely sharp. (P 1,3,4) Using different stops (diaphragm) would solve this problem.
You could try to add some more contrast (photoshop), this might gets you a more interresting picture.
So just curiousity: You're on a vacation trip here in Holland? The Keukenhof must have been a cool experience

Anyway, have fun & enjoy!