Create an illustration of Quetzalcoatl in a Renaissance-style royal portrait: position Quetzalcoatl in the center with a regal posture, dressed in luxurious and detailed attire combining Mesoamerican and Renaissance elements, highlighting quetzal feathers and gold and jade jewelry, with a serene yet powerful expression on the face, using a palette of rich and deep colors and a soft yet dramatic lighting, and incorporating symbolic elements like the feathered serpent subtly, with a sober yet elegant background suggesting a palatial ambiance, thus achieving a work that fuses Quetzalcoatl's divinity with the elegance of the Renaissance.