well the thing about tilting, as I said, nothing wrong with it
but first you must master how to level your camera
you dont just tilt the camera any angle
first you must understand what you are doing when tilting that camera
in this photo, not just the X/Y-axis, but the Z-axis as well
the photo therefore has no weight in it
its okay on a small size picture but if you enlarge it you might feel the problem
sorry I am not trying to pick on this particular photographer
but as digital photography is so common and DSLR is within reach of most people
everyone with a DSLR thinks they are photographers
a lot of the time, a simple, level picture cant even be shot
go back and shoot a nice stiff and square photo before you play with all these weird angle
would help a great deal