Out of the camera just about... as I had no access to Adobe to clone, burn, dodge & USM - which would have made this more presentable. There was an 'ugly' flower directly below this flower so I could not include it in this photo. There is another photo in my portfolio that I considered using (from the same photo shoot) yet it needed even more photoshop to make presentable.
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I really like your lighting, both in the foreground and background. You've captured the colors and softness of the lily nicely. I do notice quite a bit of grain in your background. Nothing a run through Neat Image or similar wouldn't fix.
One thing I struggled with shooting Calla Lilies was composition. It's like photographing a person. If you crop at a joint it looks awkward. Something about your composition here makes it feel like it was clipped at a joint. I think anything without the stem looks unnatural. I took a ton of shots and what I ended up posting still didn't seem right, heh.
I read through a couple of the other comments, and I have to agree with there being too much dead space. I cropped a big chunk of it out in Photoshop, and can't say I missed what was cropped out. The minimalism type feel and contrast was still there.
I really like the true white you've captured on the lily and the detail on the yellow stamen(?). Unfortunately, though, I think that the bright area near the top of the image on the left is quite distracting. You might think about cropping down from the top and in a compensating amount from both sides to eliminate most of the distraction.
I like the spotlight on the orange thing - you've given my eye the focal point you wanted me to have. The surrounding area detracts from your lovely composition, however e.g. the yellow in the upper left. I'd like to see more of the flower but the white thing at the bottom blocks the bottom and leaves the flower with a cut-off feel. I thing the white border adds little to the shot.