double switch wiring problem
It's a little hard to see which wires are connected to which screw terminals in your picture. Is there a black on one screw, and a black and a red on another, and the last screw is empty? How many screws are on this switch?
If this is the case, then just move either the black or the red to the empty screw terminal to have the top switch control one light and the bottom control another. If you want to use two separate switches, you would need to splice the incoming hot wire in a nut with two new short lengths of black cable, and each of these short cables would feed a separate switch.