The first is the best for me, I like the composition and the contrast between the colours, but the light isnĀ“t the best ( too much sun) and I would try to avoid the sky (on the top of the image only trunks and leafs)
2# The light is too hard in the top of the image. I would try to put some flowers in the foreground taking the photo at ground level.
3# The contrast is very good but the composition is a little bit confusing, I would try to focus on one or two flower maybe in the foreground or in the middle and get out of focus the others.