Over the years I've toyed with the idea of transferring photos properly doctored in Photoshop to start my woodcuts, but I find that most of my "image making" happens when I cut, not when I sketch.
Here are my original reference photos on the right of the block, some doctored photos at the top, and a pencil sketch on the block.
I generally let that "gel" for a few minutes to hours and then proceed with a permanent marker, strengthening the lines and forever committing the design to the wood. The character of the magic marker (Sharpie) also makes me simplify the design a little so as to leave some designing leeway for my trusty chisels.
Often I play with the reality of the reference photos, I liked the wild brush in the front plane, but later decided against it since I wanted a clear view from the "V" of the canyon edge into the valley below. Here is the design, ready for walnut ink and oil and sharp knives.
What do you know! How'd dat get on my work-bench? (I think I have a "printing gadgets" addiction...could someone please recommend a good eBay-sniping support group?)