Actually it's 17 photos.
The painting was laying on the table, the camera was on a tripod above. I was shooting with 23 mm @f5.6, ISO 400, 0.2 sec, and 10 sec. self-timer before every frame. I was moving the tripod with the camera over the painting overlapping ~50% of the frame (I've double-checked it). No shallow depth of field - I didn't needed it. I wanted the shots to be sharp and detailed. And that's how the are.
The problem is with stitching. I have free version of PTGui (it watermarks the final photos). I didn't wanted to buy it because I's quite expensive for pro bono job, and I thought I could stitch it in AP. Doing it manually, or making few panoramas and stitching them one by one... guys! Common! AP has stitching panoramas function. It should be able do stitch it.
Unfortunately in AP one can not choose method of stitching :( And it doesn't do well with auto settings unfortunately :( There was no issues like that in Photoshop.
Is there going to be fix in 1.8/1.9 version? Or do I have to wait till AP 2.0 ??