With this image you win my full approval and I place you in my favorite photographers list. You are good. Congratulations on your top 20 finish and boy are there beautiful flowers in this challenge.
Your composition could be improved by making it a little more off-center and cropping out the right side of the image where it is a little blown out; overall, left to right, the lighting is uneven; the left 2/3s of the image however has near perfect lighting. Hope this is helpful.