Actually, that can be explained with ~SCIENCE~
The sketchiness of line art mimics the natural lack of clarity in our peripheral vision. When we look at the real world, our high definition fovea can only focus on a small area at a time. By having a very clean line art, it creates the unnatural feel of high clarity over a large area that’s not possible when we look at real life, therefore line art tends to appear stiff and not as appealing as the sketch. This sketichiness technique was first utilized by impressionists to create an optical illusion of motion (along with other techniques like equiluminance).
Source: Vision and Art: The Biology of Seeing by Margaret Livingston
There you see? All of you who never finished a sketch before? You were doing it right all along. Proven by science!
Huh! The more you know.
