You could also try to mirror the left side of the image. In the photo that will be rather obvious to people who know the beatiful girl, but after the conversion I think it would have a better result. And once it has been engraved I think it will work out for the better, because of the more natural evenness (is that a word?) of the face. I think, by the way, you really have to lighten the lips so that they are a lit lighter than the face, while you are at hand-correcting the file. And the eyes require attention to. I think the eyes will have to be without much of the original color (it will look creepy) to prevent large holes. A grey area (a little lighter in the middle) with a small line for the iris and a slightly darker dot for the pupil. That machine sounds very interesting. Will you please post the resulting piece here?