Composition: 4, A centered subject is usually the most static. You might try moving it off to the side and then tilting the image to add energy to the subject. Also, the twig on the right does nothing to add to the composition, it merely distracts.
Technical: 6, Nice and sharp in the center of the flower. The rest of the image shows a nice shallow DOF.
Appeal: 5, I like the stark contrast of the white against the dark background. A better composition would improve the appeal here.
Challenge: 5, A nice close-up. A more macro version of the image would focus right in on the center portion of the flower, exploring the textures that the average passer-by might never see.
Overall Calculated Average Score: 5, Not a bad image... technically okay, could be a little more creative.
Pretty flower and nice lighting and focus, however it is too centered in the picture. I think rotating this image about 30-45 degrees either way would look more interesting than just vertical.
8 - Good photograph. Good capture of the texture on the ahh, stigma? and patterns on the ahh, petal? For me, a close up macro of these two combinations would be superb, but for this shot, for me, no cropping the tip of the petal (?), perhaps a different angle, to incorporate/lose the brown 'stick', not sure. Just more 'simplicity' for me would be better.