Black and white needs contrast, which you definitely have here.. but I think in this case the color might have been better, but who am I? You are the artist and I thank you for presenting it the way you thought it would best serve the image :)
"The artist is a receptacle for emotions that come from all over the place; from the sky, from the earth, from a scrap of paper, from a passing shape, from a spider’s web." Pablo Picasso
Job well done! I think not using color was a bold step and a very good one because these flowers are beautiful w/o color which I think you were think you were trying to show that which you did! Great job!
♥PJ 005