This research delves into the intricate process of person perception, exploring how individuals form impressions and make judgments about others’ personality traits based on facial appearances. Through a survey conducted among engineering students involving N = 246 participants, this study investigates the confidence and accuracy of judgments regarding sociability, morality, and competence. Utilizing attribution task based scale and AI-generated facial images, participants assessed personality traits and their confidence in facial judgments. The analysis reveals notable gender differences in the accuracy of score predictions, with females demonstrating higher accuracy than males in forming impressions based on first encounters. Additionally, females exhibit greater accuracy in judging personality traits from facial expressions compared to males, highlighting their nuanced perception abilities. Moreover, behavior emerged as the most reliable indicator of personality traits beyond facial appearance, emphasizing the multi-faceted nature of impression formation. Overall, this study contributes to the understanding of social cognition processes and the importance of considering factors beyond facial appearance in accurately assessing personality traits.