The fresco is on the wall behind an alter in a church in Turkey, I believe. The 'pilot' is looking back and around the curved painting to the other side where another craft with a different being in it is looking at the occupant of the craft in the picture.
Unfortunately my UFO Library is in storage at the moment as Sue and I separated a couple of months ago and my current space is too small for most of my 'stuff' and I don't have access to the book to get a scan of the other craft.
(As soon as we can get more images and further information, this web page will be updated. F. Ridge)