Generally you don't mind about that. A better picture is a better picture.
Also, if it is a Numista copyright picture you can't replace it. It is a little silly when the coin you have is in a better grade but there you go.
We just got a Cameo Proof of a Swiss 20 CHF Globi commemorative. It's interesting that with so much mirror-finish ya gotta take the photo dead on, otherwise background stuff gets reflected into the final image (lighting, etc). A tad Photoshop to edit out the dust artifacts and poof.