So you had chosen some painting for 3d reconstruktion. It's instruction how to get simple pseudo  stereo effect by using two kinds of transformation only: 1) horizontal offset (displacement) of disjointed layers 2) horizontal scaling ones. For example this nise old paint   had been used (Johannes Vermeer, Young Woman with a Water Pitcher). Open it with Photoshop.

     "Cross-eyed" viewing method required for this technique realization.
 

     Step 1. Layer cutting. Woman with table and pitcher, fragment of the left wall, window part - all this parts most been disjointed. "Copy and paste" technique were used in sample. Background most be mobile. Duplicate image altogether for right and left view.

    Step 2. Making depth of room. Displace background  right on left image and displace background  left on right one. I recommend to use  keyboard for this operation. It's very easy to control displacement when you see image by "Cross-eyed" method. The room is "deepen" in front of your eyes!

     Step 3. "Far away flat" effect. This effect may be obtained for fragment of the left wall by horizontal scaling ones. Stretch it on the left image and shrink it on the right one.

     Step 4. Place women between screen surface and back wall. Slightly displace her  right on left image and displace her  left on right one. Now her arm separated from window.

     Step 5. Correcting window. Stretch and shrink window similar step 2. Women's arm must be jointed with window in both images. Now window  is "far away" but lightly opened.

     Step 6. Paint out unwanted parts with clone stamp tool. Stereo image has been finished.

     Sorry for my bad English.

©Alexey El'tsov