Create a 3D model of a Roman legionary with a lean, muscular build. He wears the lorica segmentata, with overlapping metal strips and a galea helmet with cheek guards. His red tunic is visible beneath the armor, and he holds a rectangular scutum shield with Roman insignia. A gladius sword is sheathed at his side. Position him in a defensive stance, and apply high-quality textures showing battle-worn metal, dirt, and scratches