How to remove Schlage deadbolt?
In your first picture the round disk looking objects on either side of the keyway are screw covers that are driven after the screws are tightened. 

A strong sharp object, something like a chisel that you don't mind getting dull would do the trick. The pin that is in the screw head isn't very long so the cover will fall off readily after the cover starts lifting out. After the covers are removed, the screws are removed using a Phillips head screwdriver. The screws under the covers are #1 the screws in the latch are #2.