no, it's wrong . The correct way is :今天你看起来很漂亮/ 你今天看起来很漂亮 今天：today . In Chinese , the words about time, for example :just now , afternoon , 7:00 , we usually put them at first place .and subject often put at first place...like you , me , my mother.... “你看”means: look! means ask someone to see something. “你看起来”means:you look / you look like...it's for the evaluation of others.

wrong, and its impossible to figure out whether you are talking about the weather or a person. you look beautiful today. 你今天很漂亮. we rarely say 你今天看起来很漂亮，看起来 makes it sound way too superficial. if you want to say today is beautiful, then 今天很漂亮 is the way to go.

and in urdu your sentence آج تم بہت خوبصورت لگ رہی ہو

yes it means "You look very pretty today"

The words are totally right, however, we need to reorganize their sequence. It'll be 你今天看起来很漂亮。 you look so beautiful today. Your sentence looks you translate the sentence word by word. :)