Lol great shots!!
Use a bowl..
A heavy, ceramic bowl. Preferably clear glass so you can see them calm down but it doesn't really matter. Put them on the table on your white surface under your lights and put the bowl over them. Then leave it alone for awhile. The snake calms down. You get your camera ready to go, (a friend to lift the bowl helps for very active snakes) lift the bowl, and the snake stays still for a short time.
It may take a few tries to get a pleasing position but this is what some boa and retic breeders do to get good shots of their youngsters ;)