"There are no rules and regulations for perfect composition. If there were we would be able to put all the information into a computer and would come out with a masterpiece. We know that's impossible. You have to compose by the seat of your pants." -Arnold Newman
I really like this shot, lilies are such beautiful flowers and the white one you have captured is a prime example of this beauty and for me the best one of the many colours they come in.
You have got the light and shade spot on, well done.
Several of my photos are available for purchase in larger format at Shutterpoint, and some are also available in high quality framed prints at http://djholmes.imagekind.com/
" I' ve seen the sunrise in a thousand ways, I' ve seen the wonder of a summer storm, I' ve seen a mountain that touched the sky...... " Chris De Burgh