The main motif of mandalorians are from House Harkkonen in Dune, since many of the elements of SW are actually inspired from Dune. Now you get the picture. The far left one is Beast Rabban, the mid one is the evil baron and the far right one is Feyd Rautha. the visual impression is actually a poor rip-off of Dune:the movie. Especially I tried to give him the exact atmosphere of Feyd Rautha played by Sting, and actually he is based on young Sting in his Police-ear.