As far as paintings of roses go, this is quite successful. They appear naturalistic in shape and form and their colour is a realistic shade of red that morphs into attractive pinks.
The composition is interesting as the larger roses contrast nicely with the medium-to-smaller ones. Their placement leads the eye around the image, finally resting on the largest one at the centre.
My only criticism is on the use of tones. You have used the same tonal range for all of the flowers, stems and leaves. This makes the image appear flat and your focal point loses most of its impact. In future I would advise you to use a wide variety of tones and high impact highlights for your 'main rose/s' and use a less saturated and less varied set of tones for the surrounding and less important roses.