Thanks to those who have gone before me, and posted here as it helped me to get the nerve to try etching tile. I used a cheap subway tile from Home Depot. The image is my own. I played around in Illustrator with outlining and expanding the paths and I really didn’t like what I was seeing, so I reverted to just converting the image to to an SVG with no Illustrator processing. I left it grayscale. I masked with blue tape.
It took 20 minutes at full power and full speed 1000, 450 LPI (CTD). Post engrave I used Artistro Acrylic paint marker black and then wiped it off with paper towel before completely dry. I painted with the mask still intact and then gently removed the mask as I was wiping it down. I am happy with the outcome. I will be trying more in the future!