I have refined my watercolor collage sketch a bit, rescanning and working with digital variations. Sometimes I spend a long time in my chosen manipulation software in order to make my transformations and enhancements. It is not always easy or quick selecting the desired sections of an artwork, and this especially true with watercolors that may bleed into each other, and on textured paper where shadows create variations our eyes and brains will generally ignore!
So in addition to working the original a bit, I have tried light and dark as the background frame, and applied different digital manipulations on the trees separated from the window and shadows.