It's huge. You can not see this whole museum in one day. I tried hustling through the rooms, offering only customary glances at lesser known masterpieces, and still could not make it through the entire museum.
So, as you are probably not able or willing to dedicate multiple days to viewing countless art treasures at the Louvre, carefully select which items or styles are of most interest to you and your group. And keep in mind that the Mona Lisa is not that earth-shattering to behold as it is trapped beneath thick sheets of plastiglass and surrounded by swarms of pushy tourists.