The Shroud image is not manmade. Artists, chemist, pathologists, and image analysts who study the Shroud quickly come to an inescapable conclusion. It is not a painting, drawing, or any known form of artistic rendition.
Artists readily notice that there are none of the signs of painting or drawing.
There is a complete lack of any outline, brush strokes, or directionality from a tool used to create the image. Directionality, another characteristic in art, cannot be avoided unless an artist were to use a dot painting technique so precise as to be able to apply a colorant individually to top-layer fibers thinner than human hair. For deeper color the artist would need to touch more fibers in an area than in lighter areas. Furthermore, the image on the Shroud is so light and diffuse that the image cannot be seen from less than about six feet away. As Isabel Piczek and many scholars argue, an artist would have needed to work from a long distance, something that is really not possible.