Is there anyway possible to change a living room into a masterbedroom? The size of the living room is 15X13. A picture widow is on the long side in the middle.

Sure, just move your bed.
I'm not sure what else makes a room a master bedroom. Are you looking for a connection to the master bathroom? Or a clothes closet? Or a disconnect from the dining area? Or what? To do these things, you'll have to provide some details as to what you have and what you want to do.