I copied Aphrodite's arm and used warp and liquify to bulk it up.
step 2 of 7
I made a very general version of Adonis' head from the face of Aphrodite so that I could wrap her arm around it.
step 3 of 7
The bits and pieces taken from his arm, plus her hip and sheet.
step 4 of 7
I used warp and different levels of brightness/contrast adjustment layers to shade the jar. The doorway is a square of dark paint that has been gradually masked.
step 5 of 7
Foliage from the source to decorate the jar, shaded them, then reduced opacity of the merged jar and placed it inside the doorway.
step 6 of 7
On a separate canvas, I used Filter - Render - Clouds. Then I bumped up the contrast and masked out the white parts. Filter - Distort - Wave to make the swirls. Desaturate and lessened the opacity to make it look like marble.