Hard to tell which I like best. They are all so good.
But I think I like No.3 because of the backlight, the simplicity of the frame, and of course the beauty of the flower itself.
I like No.5 because of the shadows and the lighting - in this photo, the light is extra special! But also because of the vibrant colour of the flowers!
I like No. 6 because of the colour, the backlight and most of all the ANGLE, which makes the pistils shine through the petals.
I like No.7 for the very form of the flowers, your composition and choice of DOF.
I like No. 8 because the flower is so exotic and so rare and so beautiful and has such a lovely colour, and even though the rose in 8 is not as exotic to me, the colour in that photo is very appealing, too.