The last two have backgrounds that are a bit hot for my tastes. I prefer images that keep the flowers easily separated from the background. You might find that a bit of light control would help resolve that issue - unless of course you are specifically trying to pull the background shapes and colors into the composition. Depends on what your artistic vision was/is.
Thank you much for attention and commenting.I think I agree with Steven. The last one is ok because of the color difference. But the one above that, everything just blends together. Nice shots though!