From the header information of the "Rework" galleries;
"This gallery contains caedes.net images that have been modified or improved in some manner by another member. If you plan to submit an image to the Rework Gallery, please ensure you first obtain the original author's permission. Please, add a link to the original image."
So, in short.. if you 'rework' one of your own images/photos.. simply select the appropriate gallery that you normally would.
In this case; "photography->castles/ruins".
Moved your image here for you, though. No worries.