I sometimes use a photo for inspiration (1). I converted the snap into a line drawing to help me see the composition (2). Then I made up a plate (sealed mat board) with different kinds of tapes, crinkled aluminum foil, paper and glue lines (3). This plate has been used, so some left over ink has colored the plate. The fourth snap is of a print using only blue ink, while the fifth shot is a print with blues and yellows. Please note I flipped 1,2, and 3 in Photoshop so you can clearly see the difference. It is always a surprise what will come off of the print bed, even when using a photo!