No scanner? No touchpad? I don’t know of any way to import a sufficiently clean outline into the computer without a scanner. But actually, the contrast in the photo above is enough to create the one below (minus minor editings) by the graphic pen filter in Photoshop. Editing is also surprisingly easy after this way of modification. Notice that I move the foot along with the tree branch a bit and redraw the geta‘s tooth.
Given how I made it, the end-product is quite good.