Social media profiles are used for Business purposes and Personal branding, there are also many people who use them to share personal information.
It avoids pixelation and awkward image stretching. And avoiding that keeps your images looking professional.
Science! There is study published by the Psychological Science that summarizes:
a. Smile with teeth
b. Dark-colored suits, light colored button downs
c. Jawline with a shadow
d. Head-and-shoulders, or head-to-waist photo
e. Squinch
f. Asymmetrical composition
g. Unobstructed eyes
You want to share some of your hobbies or activities? Great! Use a closeup image where people can recognize you in the profile picture and your passion, hobbies, landscape travel images in the cover or feed post, stories, reels, etc.
The clothes we choose to wear and how we choose to wear them send out messages that reveal many aspects of personality and emotional health. NYT ARTICLE