Author, middle-aged man, glasses, beard, formal wear, holding a whiteboard marker, standing in front of a large whiteboard filled with diagrams and notes, explaining Microservices Architecture design patterns and principles, modern conference room, wooden table, leather chairs, natural light pouring through the large windows, blurred cityscape background, shallow depth of field, warm and soft ambient lighting, 3/4 composition, slight motion blur to convey a sense of dynamic lecturing.