The effect of the speaker hearing about the statue from the traveller as opposed to seeing it with his own eyes is. It helps emphasize how the story is a tale that is being passed on to the reader, indicating that there is a message to be heeded.
No, Use tone, the viewpoint character’s attitude, in every scene to deepen the reader’s connections to the events of that scene and to the character. While the characters feelings is what is affected by the tone.