I often make very rough mockups of images before fully investing time into them. I find that it helps to spot inaccurcies that would later become very difficult to correct, as well as giving me a rough idea of whether the composition works. Some images don't even make it past this stage!
What you see here are the early stages of various deviations in my gallery. These images were never intended to be seen by anybody, so they're very messy and they're usually created directly over the original pencil image.
Maybe you'll find it interesting, probably you won't! XD