Create an ultra-realistic full-body outdoor portrait of a stylish young man leaning casually against a modern vertical pillar in an urban setting. He is wearing a mustard yellow button-up shirt with the sleeves rolled up, light blue denim jeans, and clean white sneakers. His posture is relaxed, with one leg crossed in front of the other and his left arm resting gently against the pillar. He has short, neatly styled black hair and is wearing black sunglasses, giving off a confident and cool vibe.