In ArtGem how do you copy and paste? I cant seem to do it.
For whole picture, Ctrl-C and Ctrl-V. Surprised? :D
You may use scissors tool to cut out some area and use it as a brush or save it into one of brushes slots to use later.
For copy-pasting "scissored" clipboard data, Ctrl-Shift-C and Ctrl-Shift-V (pastes clip. data as new image).
Ohh.