Engraving photos is the holy grail of lasering. It will take countless tries, hours of frustration and tons of wasted pieces until you will be completely satisfied and can handle a broad variety of materials and picture types.
That being said, there are many excellent tutorials out there that will give you a starting point, but it won’t release you from the basic three steps of lasering:
- Test
- Test
- Test
I collected some guides and videos here, but there are many more: