What are the X's on the window panes? We do something similar here in North Carolina before a hurricane. We tape our windows like this in the hopes that if they shatter, the glass will not fall into the building.
Regardless of what the material is, the diagonals criss-crossing in each pane give a very interesting regular diagonal pattern that contrasts with the horizontal and vertical lines of the composition. Add the remnants of the vines with their very un-geometric patterning and you have an extremely interesting composition.
