A shot of the southern end of Alcatraz as seen from San Francisco.
Taken with a Sony DSC-H1 Bridge P&S in 2005.
ISO 64
f 4
1/500 sec
This is the SOOC.
...and after PP. Moved the helicopter, added clouds to the sky, brightness and levels in four layers - foreground, island, background, and sky and cropped.
To me, the biggest difference is what you can now see (for better or worse) that wasn't obvious in the original.