The type of figurative language used is a simile.
The word "like" is used to compare the pair of socks to something else, making it a simile.
Both are great ways to help improve your vocabulary and spelling. However I would suggest frequent reading to familiarize yourself with the words.
I sentence that contains an element of bias could be one that states an opinion. For example, "I think her shoes are ugly, mine are better." the person talking is biased because they really like their shoes.
Changing Parvana to look like a boy.
