From left to right : 1. Bilbo Baggins having one last craving for the ring when reunited with Frodo in Rivendell before the Fellowship takes off on its quest; 2. A lost soul in the Dead Marshes, a swampland Frodo and Sam need to go through on their way to Mordor; 3. Galadriel being offered the ring by Frodo in Lórien; 4. Grima Wormtongue, who poisons the mind of the King of Rohan on behalf of Saruman, but I can't recall this scene in particular (and could also be mistaken).