Drachenburg Castle in Königswinter, Germany. <--- Not true. This picture is actually Cinderella's Castle at Walt Disney World in Orlando Florida. I have seen this view countless times, this picture was edited to make it look like it is in Germany.
Hang a curtain rod draped with sheer curtains (or fabric) at headboard height, behind the bed, then add some white holiday lights behind the fabric and across the rod.--- maybe just a string of lights over the headboard :)