Serration is a saw-like appearance or a row of sharp or tooth-like projections. A serrated cutting edge has many small points of contact with the material being cut.

Learnt during Crejo session : Shaping The Background (2D Shapes To 3D Shapes)

Notan is a Japanese design concept involving the play and placement of light and dark elements as they are placed next to the other in the composition of art and imagery.

Positive space refers to the subject or areas of interest in an artwork, such as a person's face or figure in a portrait, the objects in a still life painting, or the trees in a landscape painting. Negative space is the background or the area that surrounds the subject of the work.

Monochrome means one colour, so in relation to art, a monochrome artwork is one that includes only one colour and its shades.

A doodle is a drawing made while a person's attention is otherwise occupied. Doodles are simple drawings that can have concrete representational meaning or may just be composed of random and abstract lines, generally without ever lifting the drawing device from the paper, in which case it is usually called a scribble.