My first thought when I saw this, is exactly what inspzil mentioned. That I wished that the flower itsself were a bit bigger.
I think that if you were to get in a bit closer on the flower that it woudl appeal to me personally a bit better. Someone mentioned that they liked it farther away, to show the environment it was in, and this is true too. Everyone sees things differently, and it's not a suggestoin to change it, but rather my own personal preference.
I do think that the focus is supurb. Great detail is shown in this flower, right down to the veins in the petals.
This looks like a rose bush we have in our yard, that produces these velvety feeling roses. Kind of really soft velvety feel to them.
The color is really good. I wonder though if it had just a tiny touch more lighting if it would have brought the red out even more.
I do like the angle and framing are good. I like how this is in the upper right of the photo. This does make for a visually appealing shot.
Lighting I think could be just a little bit brighter to help bring out some more color in the rose itself.
A really great shot overall.