Pink and White #5 (nice combination between near flower and far stems)
Yellow flower #1 (nice contrast between flower and backgorund colors)
Sunset flower #6 (harmony between foreground and background)
Orange & white #6 (the flower seems to be looking to the camera )
Pink tree flower #2 (nice shade of pink)

Pity i only can choose 5... As general comment, i would suggest to add some contrast, or lessen the brightness, to make the colors brighter. (i dont know if is allowed to process the pictures with some program like corel/photoshop/whatever)