trick for hanging photos, especially in a gallery wall: You simply use the painter’s tape to establish the position of the nails on your wall, use a level to keep them straight and hammer the nail into the right spot.
DUH! Easy way to hang pictures on the wall.. trace the frame...poke a hole where the nail needs to go...tape to the wall...then hammer in the nail where the hole is...tear the paper down and voila! your nail i sperfectly in place...the FIRST time!
Some great ideas to help you layout a design for your pictures.
Polish Folk Art
the shamanistic art of Michel Nedjar. http://www.jsaslowgallery.com/artists/nedjar/mn_1692_72dpi.jpg