I add the yellow and greens marking areas but pulling mant things into the same plane. From the landscape pictures you can see how much of it appears on the same plane. There is very little perspective in the traditional sense. Space is made by things overlapping, but at the same time this overlap can connect things that are distant.
I put the pink in the upper right to keep that edge of the picture from falling away and dragged some lighter blue over the center to keep it from dropping back to much.
 
 
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