The correct answers are:
- mood (to determine the feeling of the piece)
- medium (the material allowing viewers to see how the artist portrayed the emotion)
So, the completed sentence would read:
"When reading a poem, a reader must use their “mind’s eye” to determine the mood, or feeling, of the piece. However, a painting can tell the same story in a different medium, or material, allowing viewers to visually see how the artist portrayed the underlying emotion."