This postcard comes from Postcrossing and features the royal family of the Netherlands. From left to right: King Willem-Alexander, Queen Máxima, the Princess of Orange, Princess Alexia, and Princess Ariane.
I have always found royal families to be fascinating, maybe because the US doesn’t have a royal family (although, for a fun read, check out Emperor Norton). However, most of the people I know who grew up in and are subjects of (that is: citizens of) kingdoms or empires have quite mixed feelings on their own royal families.