I took some artistic liberties with the reflections from the windows, to make the picture move 'lively'. Think like it has a stronger light coming out from the right side window.
A lot of work with PS smart objects, had something like 30 layers at some time before I could group and merge them. Standard skew/perspective/scale tools used, inner shadow for the door pillars etc.
Check out full resolution and sources (and notice the texture symmetry too)
Thanks and Credits:
Amaze646 @ SXC.com for the stairway-picture. (3 years and 131 days ago)