There isn't one definitive "final image" in the poem, as it's highly symbolic and leaves much open to interpretation. However, the poem ends with a strong emphasis on the power of imagination and its ability to create fantastical worlds.
Here are some elements of the poem's ending that contribute to this interpretation:
* The fading of the vision: The speaker describes the "vision" fading and "sun's rim" sinking, suggesting a return to reality from the imagined realm.
* The "holy" river and the "sun's rim": These elements imply a connection between the spiritual and the physical, suggesting that the imaginative realm has left a lasting impression.
* The speaker's inability to "re-create" the vision: The speaker laments his inability to fully capture the "vision" in words, implying that the power of imagination is ultimately beyond language.
Ultimately, the final image of "Kubla Khan" is left to the reader's interpretation. However, the poem clearly emphasizes the power of imagination and its ability to create breathtaking worlds.