Following is a Syriac Orthodox icon of John the Baptist from the 18/19th century (found in the Cathedral of Saints Constantine and Helen, Yabrud, Syria).
The wings are often depicted in icons of John the Baptist because of his status as a messenger. The scroll that John the Baptist holds quotes John 1:29 and reads (translated into English): “I saw and witnessed concerning him, ‘Behold the Lamb of God who takes away the sins of the world.’”
Orthodox Icons are not drawings or creations of imagination. They are in fact writings of things not of this world. Icons can represent our Lord Jesus Christ, the Virgin Mary, and the Saints. They can also represent the Holy Trinity, Angels, the Heavenly hosts, and even events. Orthodox icons, unlike Western pictures, change the perspective and form of the image so that it is not naturalistic. This is done so that we can look beyond appearances of the world, and instead look to the spiritual truth of the holy person or event. (Source )
See also John the Baptist.