Abstract expression - depicting something not having a physical or concrete existence. 

Origins of Visual Abstraction

• Calligraphy: Chinese and Islamic.
• Far East painting schools: Wang Mo (王墨) (splashed-ink);
• Chan-buddhist painting, Liang Kai (梁楷), Zen art (e.g. enso), Dajian Huineng (大鑒惠能), Sesshu Toyo;
• Tiantai buddhism: Yu Jian (mid-13th century),
• Daoist painting: Zhu Derun

Representing wild life, animals and vegetation, ecosystems and individual living organisms.

Flora - plantsobserved collectively, an assemblage of plant species, any botanical characteristics of the environment - forests, trees, bushes, flowers, etc.

Fauna, animal life - representation of animalsand other living beings, that usually have the capacity for spontaneous movement, and differ from plants and from people.

Organisms are individual forms of life, composed of cells - organic living systems that functions as an individual entities.

Being is an individual form of life, an organism, or an imaginary creature.

Landscapes represent views of natural scenery or countryside.

Nature morte/naˈtʃʊə ˈmɔːt/ - still life pictures, depictions of objects, artifacts, constructions, all still and artificial life inspired artworks.

Natures mortes depict various inanimate objects with some level of abstraction.

Artifactsare objects made by human beings: handmade and mass-produced things and tools.

Objectis something material, relatively stable in form, visible or tangible, a thing that you can see or touch.

Representation of faces and figures of human beings (Homo sapiens sapiens) in my artwork is usually motivated by the expressiveness of the emotion, depth of ideas, or beauty.

My fine art portraitureand figurative paintings are primarily based on figure drawings of nude and dressed life models and other real people. I rarely use photographs. Sometimes, I analyze my own photographs taken from different angles and in different lighting for a while, to commit to the general feel of the personality to my mind, and then work from there. 

Photographic environmental portraits and videographic depiction of persons are more meaningful to me than most other real life depictions.

Portraits - artistically represented persons, depiction of persons or groups, figurative art (figures and silhouettes) - realistic or at higher levels of abstraction - that displays the expression, personality, and mood of the subject.

Portrait painting is a figure painting that focuses on the creation of a likeness of a particular individual or group.

The focus of a portrait is usually the face, but the entire body and the background or context may be included, especially in environmental portraits.

A figure painting is a work of fine art in any of the painting media with the primary subject being the human figure, whether clothed or nude.

In figure drawing only dry media is used, it may be a composed work of art or a figure study done in preparation for a more finished work such as a painting.

A life drawing or painting is a rendering artistic representation of the human figure from observation of a live model.

The degree of representation may range from highly detailed, anatomically correct renderings to loose and expressive sketches.