A detailed prompt designed to restore a faded vintage photograph into a high-definition professional portrait. It specifies DSLR-quality color and detail, advanced upscaling, and constraints to ensure the image looks natural, retains exact facial features, and maintains clarity, comparable to results from a high-end Canon camera.
"Restore this old photo into professional portrait of DLSR - quality colour and detail, using an advanced upscaling algorithm comparable to the results from {argument name="camera model" default="canon EOS R6 II"}. Ensure the restored the image looks natural, retains exact facial features, has great clarity......"

