It's not uncommon, on lume plots that small you'll never see it IRL. Put your phone 6 feet away and the watch image is still larger than it will appear on your wrist. How do the lume plots look now?
To answer your question, the surface of a lumed indice or hand is never going to be perfectly smooth, it's not paint it's a powder mixed with a binder, there will inevitably be certain degree of texture to the surface.