Here are some key elements described in the poem:
* The city's quietude: The poem emphasizes the stillness and peacefulness of London in the early morning, before the bustle of the day begins.
* The beauty of the architecture: Wordsworth focuses on the grandeur and elegance of the city's buildings, particularly the Houses of Parliament and the Tower.
* The presence of nature: Despite being in the heart of a bustling city, Wordsworth also sees the beauty of the natural world, including the river Thames and the sky.
* The sense of wonder and awe: The poem expresses a sense of wonder and awe at the beauty and majesty of the city, and the poet's ability to see its beauty even amidst the urban landscape.
Overall, "Sonnet Composed Upon Westminster Bridge" is a meditation on the beauty and serenity of the city, a reminder that beauty can be found even in unexpected places, and a celebration of the human capacity to appreciate the world around us.