Send a message to the person who requested a photo of the grave monument of Agnes Marshall with the following comment:
I am preparing the geneaology of the Robertson family for the daughter of Charles and Grace Robertson (Grace McFarlane Thomson) as a present to Margaret for all the kindnesses she has shown to my family. It would be wonderful to be able to attach even a grave marker to as many of her family as possible as I am not able to provide her with anything more than the records for each of her relatives. This picture/image would be a start!