GIMP is also another free program. Remember, though, that you don't want bow limbs to look exactly the same on the tree/in the picture, which is a static, symmetrical way of drawing a bow in nearly all cases. That is, drawing the bow in your hand will change the tiller, most often putting more strain on the lower limb. As such, you'll want a stiffer lower limb. I use a gizmo more than I use my scraper and only work the bow to about 4-5" inches shy of its intended full draw on the tree. I do the rest of it while drawing it in the hand. I use a full length mirror and, most importantly, a video capture so I can SEE the limbs move, recover, etc. I much prefer the latter to a still picture on the tree. Hope that helps!