The Artwork is done by hand. I was there/involved with doing mine myself. Jeremy is right, and the process is as follows:
1. Your image is loading into computer software
2. Adam sizes it down to an approximate size that will fit most IEM face plates, then "prints" the image to a flat piece of acrylic to test depth, detail, etc.
3. Your actual earpieces are placed, angled appropriately, under the laser engraver, and the actual engraving is done.
4. The engraved image is hand painted/filled with acrylic paint. (My guess is that what you're seeing on that one monitor is where the paint is a little thin and/or there are brush marks)
5. The acrylic paint is dried, and then...
6. A thin layer of clear acrylic is laid on top of the artwork with a syringe
7. The whole thing is buffed clear.
As far as I know, JHA has no way to actually "print" on the earpieces, at least not yet.
Hope that's helpful information.
I can understand why Jeremy is waiting on his artwork. The current method is fine if you are looking for a relatively simple design. For things that are extremely complex with small areas of differing colors, I would wait.