Structure:

"Ozymandias" takes the form of a sonnet in iambic pentameter. A sonnet is a fourteen-line poem, whose ideal form is often attributed to the great Italian poet Petrarch. The Petrarchan sonnet is structured as an octave (8 lines) and a sestet (6 lines). The octave often proposes a problem or concern that the sestet resolves or otherwise engages.

Rhyme scheme: ababacdcedefef

Shelley uses desolate, broken words such as “vast,” “trunkless,” “shattered” that give a sense of loss and destruction.

By using the words “lone” and “level,” the poet applies the equalizing forces of nature to the mortality of the accomplishments of mankind.  

The king’s blunt announcement of his name shows his pride for his position and himself.  By calling himself “king of kings,” he alludes to God and believes he is greater than all other men. 

this sonnet is a clear example of romantic poetry because of :
-its exotic setting
-the extensive imagination
-the reality of the powerful kings

Ozymandias was the second name of Ramses II, so the desert land is the rapresentation of the Egypt.

Comment:

The lesson of this poem is that nothing remains forever and at one point will end..the statue that Ramses got made of himself now lies in a desert with no power, no respect, no caree.

In the poem  Percy Bysshe Shelley creates the image of a wrecked sculpture to show that nature destroys all, he uses an allusion to the lost accomplishments of a king to convey the mortality of personal glory.