Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

So, as we look at this image of the Ruby impostor and Ruby, we notice the difference in the sideburns.

So, you notice the beveled shape on the left. Also, I drew a line showing the distance between the beveled sideburn and the ear. I didn't draw a line on the right because there is no distance: his sideburn goes to his ear.