I was inspired by this image by Connie J. Bagot:
Orange I tried to reproduce what she did, but her photo is still much better. I'll see what I can do with this one.
Used a flashlight to illuminate the slice from behind, and then move it to illuminate its front, all in 2s time. Adjusted hue to cast the yellow lemon into reddish-orange tone, to make a more interesting shot.
Cloned out some traces of light, and burned hot spots in the lower left.
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6 - I like the concept. Lacking the expected color though. Not sure about the lighting, though it does give 'something' to the rind. The 'edge' bottom left is distracting/detracting.
The reflection on the water and the water itself is great. I think the lighting is a tad harsh - I like it on the right side but on the left it makes the orange a little unattractive. I think it is because it penetrates the orange peel to some degree. I think the composition/crop are good. 6 - good luck in the challenge!