Ok cool, that worked!
Here's another photo of the crypt taken during the same visit - nothing in the window. (first photo)
The next day I went back - in the second photo, there's something quite evident in the window of the crypt (I cropped the photo so you could see it better - otherwise unretouched).
Then in the third picture - there's nothing in the window, and it was only minutes later. The other thing to notice in the third picture is that there is no lichen pattern at the base of the tree, so that would eliminate that possibility regarding my first post.
In the fourth picture, there actually is a large spot of sunlight on the tomb where I thought I saw the boy (picture in my first post). Here it clearly looks like a sunspot, where in my first post it doesn't really.
What do you think? In both posts I've only cropped two photos, and that's it. Thanks!