I like the blank face idea allowing the viewer to imagine their sons or husbands. I would change the headstone, it might also be how it shows on the photo but I had to view the original picture three times to figure out what was in front of the solider (it's probably not finished and on your list). I am a little confused by the fall colored leaves on the tree and flowers growing on the side (again that could be my screen not showing the true color).
But I think its going to be awesome when your all done.