 Little more than a year after her birth , Maria Theresa was joined by a sister , Maria Anna , and another one , named Maria Amalia , was born in 1724 . The portraits of the imperial family show that Maria Theresa resembled Elisabeth Christine and Maria Anna . The Prussian ambassador noted that she had large blue eyes , fair hair with a slight tinge of red , a wide mouth and a notably strong body . Unlike many other members of the House of Habsburg , neither Maria Theresa 's parents nor her grandparents were closely related to each other . 
