To create a JPG from an ArtRage painting, when you're in ArtRage, open the 'File' menu. Choose 'Export As Image'.
From the file dialog-box that pops up, at the bottom there is the option to select the 'Save as type'. Choose 'JPEG Image (*.jpg)'.
Then type in the file name you'd like to call your painting, and hit 'Save'
That will create a JPG of your painting.
Note that if you want to be able to keep all the layers and paint information to use later, you should also save it as a normal ArtRage project by choosing the 'Save Painting' or 'Save Painting As...' option from the file menu.
I look forward to seeing your masterpiece posted here!
AndyRage's mantra for graphics engine code:
"Sure - how hard can it be?"