In fact, they are a truer representation of his cruelty than he would probably have desired, as this sculptor would also have been a part of the populace that Ozymandias ruled over. Contrasting hugely with the absence and death of mighty Ozymandias is that sculptors art, which lives on centuries after his own death its sculptor well those passions read, which yet survive, stamped on these lifeless things. In the face of nature, art and time, Shelley shows that human hubris is reduced to nothing.
Also, the inscription by Ozymandias that urges the onlookers to Look on my works, ye mighty, and despair! in the end mocks the kings own hubris as all there is left to see is decay and vast stretches of the lone and level sands. The way the passage of time has been presented also makes the irony greater antique land; speaking from the vantage point of history Ozymandiass pride seems even more ridiculous in the face of his total eventual destruction, which was inevitable. Neither his property nor this self proclaimed king of kings himself can conquer the ravages of Time.