Wow, so vivid! This is the deepest, richest blue I remember seeing in the challenge. Very nice. Is it dyed? Or hue-shifted? Surely there aren't roses really that color in nature? The light on the leaf (or whatever the things are) on the left and on the bottom left is a little distracting because it's so bright but it would be difficult I'm sure to fix without taking away the vividness of the flower itself.
Nice image....but the edges ( when you select for selective hue/saturation) are seen in the image and they are very sharp. could have made them softer with spot blur.
Good lighting, depth of field, and sharpness. The details are wonderful as are the textures in both the green stem and the blue petals. A very pretty shot.