The 'Portrait Relight' workflow in ComfyUI is designed to enhance your images by altering their lighting based on a reference image. This workflow utilizes the Qwen-Image-Edit model to intelligently adjust the lighting of a target image, making it appear as if it was lit under the conditions of the reference image. The process involves several key nodes, including the LoadImage node for importing images, and the SaveImage node for exporting the final result. The workflow is particularly useful for photographers and digital artists looking to achieve consistent lighting across different images or to experiment with creative lighting effects without the need for physical lighting equipment.