With photo engraving the following rule applies: less is more!
Often, the laser performance and the resolution used are too high, and the image becomes too flat and shows little detail, as the raster points overlap. If possible, the material should only be engraved slightly at the surface. A guideline is about 10% less laser performance compared to a standard engraving job on this material.
TIP: In order to find the perfect parameters for your material, you can first engrave a grayscale matrix.
More about Grayscale matrix