Beginning my "marathon" painting: Cullasaja Falls

Where do I begin?

Because my panel is actually larger than any canvas I can get my hands on, I had to prep the panel itself to receive the texture, inventing the gloppy substance that will readily receive the texture I will apply. So here's the recipe:  1 c. gesso, 1 c. wood glue, 1 c. modeling compound plus a tablespoon of secret sauce. Mix thoroughly (no tasting), pour into paint pan and roll on the panel. Viola! (see -- half artist, half mad scientist).