At low levels, it can appear as confidence or self-assurance.
At high levels, it can involve grandiosity, entitlement, lack of empathy, and a strong need for admiration.
At extreme levels, it may be associated with Narcissistic Personality Disorder (NPD), a clinically diagnosable condition.
A single visual illusion cannot measure any of that.
However, the way people react to the image can sometimes spark interesting psychological reflections.