So that was the first time i have ever posted anything on this forum and didn’t until now see that there’s been so many comments!! My apologies! But here was my process…
I have been using the App Lightroom. (And please forgive me I’m self taught and have no graphic design background so my terminology may be off).
I pretty much lighten the photo almost to the point of blowing it out. Sharpen A LOT, raise the “grain”, etc etc.
As for my settings, i convert to dots, speed 1000, precision 100, lines 270 and viola!
And trust that this has taken A LOT OF TIME, wasted material and patience
If you would care to, it might help people trying to replicate this level of result if you uploaded small versions of the artwork as loaded into the GF UI. The examples showing the levels and contrast are useful targets when editing.
Understandable faced with the unknown, but speaking from experience you have a great adventure ahead of you. Any help you may need is found right here. Enjoy!