In theThird age  there were still Maiar in physical form to be found in Middle-earth. The most important of these were Saruman, Sauron (originally also of Aulë's people), and Olorin, known as Gandalf, who belonged to the people of Manwe and Varda .

Taken from:

http://www.glyphweb.com/arda/m/maiar.html

The image is the representation of one of the most famous of the Maiar, Melian, the mother of Luthien Tinuviel, the most beautiful creature known to man. Here she is represented beside her husband Thingol, by the artist Maria Lombite Ezpeleta.