OK, another rose. The background is a little busy, I think, and the lighting a little hard-edged for a soft subject -- perhaps try lighting by reflection or putting white (or red) fabric in front of the sun. That might also help the orange tinge on the rose.
The detail is nice, but the colour looks somewhat washed out. Also, roses turned out to be a very common topic, and this picture doesn't really do anything except have a reasonably nice picture of a reddish rose.
It's a nice flower, but the color is not very rich and I wouldn't call it red myself. Flower shots aren't very original, especially roses in a challenge called "red", so you have to really pull off a great looking photo to impress me with this type of shot. I think it's a nice photo, but not terribly appropriate for the challenge.
Your rose has really good definition and the angle of the shot is pleasing. The only thing I can think of changing is maybe the color of the red. Make the red a little darker and a little red'er. I think you might be able to use levels on photoshop if you have access to it. Maybe an input level of 60/1.68/2.20 (rgb) might help it stand out more. Ok enough blah blah from me :).
OK, another rose. The background is a little busy, I think, and the lighting a little hard-edged for a soft subject -- perhaps try lighting by reflection or putting white (or red) fabric in front of the sun. That might also help the orange tinge on the rose.