For the practically minded (hanging a picture)

[SourChipmunk]

The only problem I see with a single screw/nail in the wall is that the centre support in the frame might make it difficult to level. Unless it is hung diagonally, which would look really cool with that painting.

 

[tigerstyle]

It's so light you'd never know, the friction would probably hold it at anything you set the picture at (within reason) angle that is.