Pope Pious XII writes in the same Apostolic Constitution where he proclaimed the dogma of the Assumption:
"Treating of this subject, they also describe her as the Queen entering triumphantly into the royal halls of heaven and sitting at the right hand of the divine Redeemer" - Munificentissimus Deus.
So, with this image of Jesus sitting at the right Hand of the Father, and Mary sitting at the right hand of Jesus, we have those two who are at Jesus' "right and left hand side" in the Heavenly Throne. From our perspective, the image is that Jesus is in the middle, Mary at the left, and the Father at the right. Would this be the image we'll see in Heaven? - at least this can be a representation as we see in frescoes shown in churches, there can also be a painting of Jesus in the middle, Mary at the left, an "old man" representing the Father at the right, and a "dove" on top of them representing the Holy Spirit.
This is just my personal reflection. Do you have any thoughts? let me know.
Grace and Peace.
John 3:27; John 15:5; Matthew 19:26