Looking up...
a visual representation or image, often created by drawing, painting, or photography
The artist displayed his latest picture at the gallery.
The artist showed his most recent visual representation at the gallery.
Can also refer to a mental image or a scene in a movie or book.
a mental image or idea
I have a clear picture of what I want to achieve.
I have a vivid mental image of my goals.
Used metaphorically to describe a clear understanding or vision.
Remember that 'picture' can refer to both physical images (like photographs) and abstract ideas (like mental images).
'Take a picture' is the most common collocation, meaning to photograph something.
From Middle English 'pictur,' from Old French 'pictura,' from Latin 'pictura,' meaning 'painting,' from 'pingere' (to paint).
Can be used both literally (a physical image) and figuratively (a mental image or idea).