Trying Different Layouts - Paper Pieced Trees

I don't think I'm going to mount these on a black background even though that might seem the natural thing to do.  I hauled out a piece of dark green. This may be about GREY but it does need some help.

The first image is almost a duplicate of my work wall layout. Each tree is beside or above its' twin with the silver tree in the centre.

The second is a gradation I wanted to play with using the backgrounds as a guide, lightest to darkest.

While this is a natural layout for 25, I'm not sure it's what I want.
Neither do much for me at all.
Maybe the silver tree should be bigger??!!