The template of this watercolor picture is "The Scream" by Edvard Munch from 1890. Probably almost everyone knows this picture, so it is well suited as a motif for this eye test with dots. The method of painting is quite simple: the colors of the original are painted as colored circles on the picture. The watercolor paint allows you to mix any shade accurately without steps. I used Horadam watercolors from Schmincke.
The special thing about this kind of "neo-pointilism" is that the closer you get to the painting, the better it is to look at. The closer you stand in front of the original, the more clearly the dots stand out. This makes the coherent motif quite difficult to see. The further one steps back, the more clearly the image itself becomes recognizable.