The first of the Joyful Mysteries is the Annunciation. This is when the Angel Gabriel asks Mary to be the Mother of Jesus. Notice the three-rayed nimbus around the dove indicating the Holy Spirit. (Note: A simple nimbus is used around saints/holy people. The three-rayed nimbus is reserved for persons of the Holy Trinity.)
The lower window Pane pictures are the Lily, a symbol of purity and SR referring to the Latin “Salve Regina” which translates as “Hail Holy Queen”