• Sketchbook pages, large figure sketches, gesture drawing, anatomy studies, urban sketching, blueprints, underpainting, and work in progress.

Sketch - a rough drawing representing the chief features of an object or scene, a preliminary study.

Art compositions created with computing devices.

Digital art is an artistic work or practice that uses digital technology.

• purely computer-generated, e.g. fractals, algorithmic art, etc.
• manipulated scanned or digital photographs;
• images created using vector graphics software,
• images drawn using a mouse, stylus, or fingers on graphic tablets.
• 3D art.

Elements and principles of art, color theory, swatches, visual communication, figure-ground perception, gestalt laws, perceptual organization, stamps, stencils, prints, posters, supergraphics, applied art pieces, content illustration, concepts expression, visualization, illustrative line work, book covers, interiors, visual plans and drafts, functional drawing, prototypes, graphic design, fashion design, needlework, decorative arts and crafts.

Design - an arrangement of elements or details in a work of art or a product, the creative art of executing aesthetic or functional visions.

Illustration - decoration, interpretation or visual explanation of a text, concept or process, designed for integration in print and digital published media.

Applied arts - design and decoration of practical objects to make them aesthetically pleasing.

Color theory in the visual arts is a practical guidance to color mixing, combinations, and applicatio for specific visual effects.

In 15th century CE, color theory principles first appeared in the writings of Leone Battista Alberti and the notebooks of Leonardo da Vinci. In the beginning of 18th century, Isaac Newton's Opticks was published.