Backdrop is roughed in

Today I finished the backdrop - or at least cutting the material for it.  I am using 1/8" foamcore.  Just easier to cut etc.  I will paint it sky blue and apply photos of the mountains.  Unlike the Sn3 layout, the photos will not be all that high given that this is N scale and the mountains are in the distance.  It is interesting how the backdrop - even in white - changes how the layout looks.  I wanted to get this done before I add styrofoam hills between the backdrop and the mainline track.  Sort of a chicken and the egg sort of deal.  And I want to meld the foreground hills into the photo.