I like the arrangement of the roses in this upload. It's too bad that the white ones got "blown out" and if you are using a trial program, the lines they put in are showing, or perhaps that's an effect you were going for? I guess I'm just throwing out ideas as I'm looking here. :)
"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
It’s a shame that the yellow flowers are blown out. Did you use a flashgun? If so you can soften the light by putting several layers of white hanky over it. The composition is excellent. Personally I don’t like the grid but the black background is a real strong element and shows well against the blooms.