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Tracing designs out is a great way to preserve books, and patterns, get a feel for the pattern and to learn to draw. For those of us who believe we can't draw when we begin this is the only way to gain access to the designs we love. After tracing 1000's of patterns I can now draw patterns freehand. You get a feel for the shapes of flowers and leaves for example. At the same time, you should also be aware that tracings are only a guideline. If your brush and hand do something different, don't worry about this too much. You are not the same artist that created the design in the first place. So...IMHO yes trace out designs till your get a sense of freedom and confidence for sketching your own with a pencil on the surface.