To determine which detail is present in the poem but not in the painting, let's analyze the options:
- a somber mood - Both the poem and the painting convey a somber mood.
- the people of Camelot - The people of Camelot are mentioned in the poem, but are not depicted in the painting.
- The Lady of Shallot - The figure of the Lady of Shallot is present in both the poem and the painting.
- the boat - The boat is present in both the poem and the painting.
Based on this analysis, the correct answer is:
the people of Camelot