I live in the Dallas-Fort Worth area.
I feel that all memorials that we enter are really the property of the families of the deceased, and so (1) I strive to make them as nice as possible, and (2) if they ask anything to be changed, I will gladly do it.
I feel that it is our duty as contributors to take the best photographs possible, and ensure that the entire gravestone is pictured (and clean).
Also, it is fine to add more gravestone photos to mine, especially if it is higher resolution, one without shadows or dirt, or is a close-up showing more detail!
While credit is nice, any photograph that I post to a memorial may be used without my expressed permission.