MC Etcher and engraving photos

Does anyone have speeds and feeds for the MC Etcher? Also need to find out how to etch a photograph on acrylic and glass. I have several projects that I need a realistic image of Christ. A cartoonish line art image will not work. He was a real man is what I am trying to portray. All help would greatly be appreciated.

I wrote a bit about the M.C. Etcher at:

For photographs see:

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