calmness
there is no characteristic.
Atanomical correctness
The word line in art means a line is a basic element of art, referring to a continuous mark, made on a surface, by a moving point.
One of the distinguishing characteristics of early Renaissance art is that they used naturalism. The subjects of the art are put in natural and realistic poses.
one-dimensional
repetition
Straight and long, and of one or possibly more colours.
There are many things that could be considered a characteristic of modernism. The shiny metal abstract art is considered a characteristic.
One characteristic of Romanticism in art is an emphasis on emotion and individualism.
calmness
there is no characteristic.
Concentration and creative
Atanomical correctness
Anatomical correctness
A contour line in art is an outline of a subject with no shading.
LICA will convert photos to line art and would be one place to view line art. You could look at something like Park West or another art gallery to see if any of their artists do line art.