Cybersecurity expert, male, 30s, strong facial features, glasses, short brown hair, black blazer, white shirt, dark blue trousers, sitting, desk, office, books, laptop, coffee cup, notes, pens, architectural design, technical security, defense in depth, least privilege, segregation of duties, network diagrams, system architecture, firewalls, intrusion detection systems, encryption methods, secure protocols, threat modeling, risk assessment, 3D composition, warm lighting, shallow focus, professional atmosphere.