I don't have any pics of the actual campsite, but I do have an interactive pic of the area here:
http://www.virtualbigbend.com/tour/paint_gapI have stayed at PG2 and 3. I like the sites but 2 and 3 are too close together. I suppose I would take 3 as it is the last site before you get to the "4x4" area of the road. There is a great vista (as seen in the Panorama) up the hill from the site. PG4, although I have never stayed there, it's not my cup of tea as you're down in a pit with no view stuck in between two hills. PG1 is probably good too, but not far enough away.
The view of the Chisos and the Sunset reflecting off of them in the evening are outstanding from PG1-3!!