Getting it down on paper

A vertical piece or a horizontal?  Maybe a forest but I like the idea of one larger, main tree to be the focal point.  And, if that's the case, what shape best suits that purpose?

I'm sketching around trying to decide those questions with very small (5" x 7") and very rough (as you can see) sketches. 

I'm also trying to decide where to place the lights and darks and how and where I might use those fabrics I pulled out earlier.