Just a quick plug, we have an art theory forum and a monthly critique thread too.

What type of day is it?
Is it overcast or sunny?
If its a sunny day, then you need to make the shadows bluish. The sky is a light source too.
It its an overcast day, then the shadows have to be softened a lot. On overcast days, you don't have a direct light source, so all the shadows are very weak.

Maybe you could move the viewpoint closer to the letter but leave a little bit of the grave marker unless you want the grass in the picture. Can't go wrong with parking the camera near the objects of interest.

If you reduce the brightness of the marble (diffuse), can make the letter more prominent.

Whatever you do, do not expect descriptions to explain what your picture is doing.
Make sure your pictures can speak on their own. Can add notes for more details but what you want to show should be right there in the picture.

I stink at eyeleading, can't see/feel it too well but maybe you could project a shadow of some tree limbs, you might get some eyeleading to the letter since viewer's eyes follow the outlines of the grave marker. That won't make sense if its an overcast day. See what you could do with shadows.