This is a very interesting 15th century Cretan icon of the Dormition, or Falling Asleep, of the Most Holy Theotokos which shows at the top the theologoumenon (not dogma in the Orthodox Churches) of the Assumption.
"Cry out, O David, and tell us, what is this present feast about which you sang in the book of Psalms? And David says, "Christ has carried up into the heavenly mansions her who bore Him without seed. I sang of her in the Psalms calling her 'daughter, bride of God and virgin'. Therefore, mothers, daughters and brides of Christ, rejoice and call out, "Hail to you, O Lady, who have been translated to the Kingdom on high....The Earthly Heaven takes up her dwelling in a heavenly and imperishable land. ... The gates of heaven were opened wide and the angels sang, as Christ received the virgin treasure of His own Mother" A sessional hymn (in the 4th Tone) from the Orthros of the Feast of the Dormition of the Most Holy Theotokos