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Pierre…. Something that can only be completed from the original is to correct the vertical perspective as if it were taken with a view camera. This would eliminate the "falling building" effect of pointing our cameras upward.
One never knows what the original artist had in mind when we view an image.
Here is a shoot I took a few years ago. At the time I was pretty chuffed with it, but now that I have a D800 I really wish I could go back and retake it. Not a lot post, except for some cropping and color saturation:D7000 | Tamron 70-300mm @ 116mm (174mm) | 1/500 | f/6.3 | ISO 100
The lens is a AF DX Fisheye-Nikkor 10.5mm f/2.8G ED which has had the lens hood cut off.