The biggest secret to professional looking string art is to use a drill press instead of a hammer to set your nails. A drill press, or even a hand drill in a pinch can make perfectly aligned holes that look very sharp. You'll never hammer again once you see this trick in action.
Write your own woodworking book that shows your unique journey, with room for details on 20 projects and plenty of room for notes and ideas. Record your discoveries, secret wood finishing formulas, and more. Over time, this will become a personal treasure and a trusted resource. Happy building.
The best string art tutorial online, super simple, and I teach the trick to making your nails all line up really straight and even. I'll give you a hint, it doesn't use a hammer. You can also use these very same techniques to make any other design once you know the basics. Happy building.