Why do you miss out 'are'?
There is no verb "to be" in Turkish although there is a set of suffixes used to express something similar. However, in the 3rd person, you are often not required to use a suffix :)
Why isn't it "güzeller"?
There is no need to use the plural suffix more than once in this sentence...in fact it sounds extremely odd. There is no sort of adjective agreement in Turkish as in other languages.