A self portrait is, in the most simple and broad description, a depiction of the self. This means any type of depiction (literal and physical / metaphorical), via any medium.
What is the “self portrait” that I focus on with my art? My primary intention is to utilize photography of my actual, physical self (in part or whole) to express or communicate something.
What about selfies?
A “selfie” is a spontaneous creation, mostly to document a condition, time, or place we are in, physically. An “artistic self portrait” goes beyond this as it strives to do more, to go deeper, and usually requires more planning, skill, and effort than a “selfie.”