Observation drawing as an action, involves the depiction of observed features and spatial relationships. With an intention to accurately depict what is observed, the drawings can be stylized (like a map) or highly rendered with accurate construction of volume, shadow, and perspective.
The act of drawing from observation involves heightening the attention to spatial relationships, surface and texture details. Marks (pencil) on a surface (paper) become artifacts (records) that function to document observed details.
Skill in the documentation (rendering) aspect of drawing involves hand-eye coordination and training, as well as knowledge of using marks to convey Cartesian spatial relationships.
Observation skills are enhanced by directing cognitive attention (value) to what is observed, and extending the duration of observation focused on a singular subject or scene. The importance of cognitive attention focused on visible surfaces and spacial relationships can also relate to mindfulness practice.