The theme is of disappointment. Alfonso is clearly not fond of his genetics and his teeth are naturally built like this. He sees a star in a magazine and sees he looks like him in some ways but his mouth is closed and Alfonso assumes he has all his teeth perfectly in place.
Answer: Because he is not willing to let go of his riches, his title and his queen.
Throughout the play, Claudius gives us information that hints at the fact that he is somewhat regretful. He seems concerned with getting into heaven, and he also claims that what he has done is wicked. However, he does not seem to be truly regretful. If he was, he would do anything to rectify the situation. This would mean giving up his title, his riches and his wife, and allowing Hamlet to become king. However, he is too attached to material things, and is not ready to let them go.
Petrarch's Sonnet 18 is about Laura, her beauty and Petrarch's incapability to describe her beauty in a proper way.
His love for her is related in this sonnet. He is continually praising her beauty
"When first I saw thee I recall the time,
Pleasing as none shall ever please again."
"...Full oft I oped my lips to chant thy name..."
It is also a poem about defeat. He uses repeatedly negative words and phrases to state clearly that her beauty is impossible for him to describe, "unsung...in my rhyme". He hasn't got any possibilities to make a proper description of her beauty, nor to describe her brightness.
"But ah, the pen, the hand, the vein I boast,
At once were vanquish'd by the mighty theme!
He uses negative words and phrases to strengthen the idea of his inability to make a suitable portrayal of her because her beauty is such that it exceeds his chance to describe it. He hasn't got the strength nor the genius.
