Answer:
(If your talking about a selfie like for a picture) A selfie is photography and does not usually require other elements such as rhythm or harmonizing.
A painting or drawing of a self- portrait uses elements such as the two listed above. Other times, they have a certain style that can only be shown through those mediums to show self expression.
They are alike by showing self expression of emotion.
The purpose of self-portraits in art history convey the artists current emotion. We can all learn from these portraits to show how we express ourselves. Overtime, the portraits influenced other artists.
Explanation: