Dear Goosepoint, Stunning trees and beautiful paper piecing. I am fairly new to quilting, but have some art experience and I would like to suggest that you cluster 4, 6 or 8 tree blocks together within your sashing rows. I am basing my suggestion on the display of your trees in the second photo. The blue is powerful and you may lose visual impact of the gorgeous trees to the sashing.
Please share a photo of your finished quilt when it is done.