Scenery suggestions to cover Insulation foil at back of layout?

[Rob.]

I'm in the process of moving my layout in the attic.

 

 The bulky roof-insulation foil meets the back of the layout at an angle, leaving only a narrow space (especially height) in which to insert any scenery- see photo

 

It's not possible to move the track forward due to space.

 

Any tips / suggestions on how to best make this area realistic, maximising the effect?    Eg inserting trees / foliage to mask the foil, or covering the foil in some way?

 

Any suggestions would be appreciated!