This was taken with my 50mm that I had flipped around backwards. No artificial light, just the morning sun. I've almost forgotten how to process a photo!
Photoshop CS5 Topaz denoise
Highpass filter layer
Vibrance layer to boost
Levels layer for slight tweekage
Dodged some bits, mainly lower left corner and a touch in the center of the flower
Topaz Adjust exposure correction on masked layer to bring out some more controlled highlights
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I like the DOF you have and the framing of the picture. It seems like it has been over sharpened where the curve of the orange pedal leads to the green background (lower left)