Hi Mahogan!
You could try this:
Open your photo and your cloned image file
Click on the photo file to make it the active document and click Select > All
Click Edit, Copy
Click on your cloned image file so that it's the active documentand click Edit, Paste in Place
A copy of your photo will now be a layer in your cloned image file. You can move it up on top of your painting or down underneath your painting. You can also adjust the opacity of the photo by moving the Opacity slider.
Hope this helps,
Wendy