The art develops the uniqueness of the product and the craftsmanship the quality.
I have become acquainted with a very good painter and one of the best drawers I know. He does a lot of portrait commissions. The first half hour of studio time is spent honing his drawing skills. You might find his practice method interesting and useful. He draws on tracing paper- the more transparent the better. You might even try acetate. He works primarily with the human form and chooses a photo or drawing then tries to copy it as perfectly as he is able. He does not use calipers or any other measuring device forcing his eye and mind to be trained in seeing and evaluating relationships. When he is done he places the drawing over the picture to see how well he has done. It's challenging and an exercise I am going to start doing. He works with people but I don't see any reason why you couldn't enlarge scroll or ornaments and then draw them.
I like to draw and my approach to engraving is very similar to Theirrys. I also understand that for some it is a hobby and templates can have a place as has been well explained. Many of my students have a good day job that they enjoy and simply want something to do in the evenings and weekends that doesn't require them to deal with people or a computer screen.