When you've noticed something and want to point it out to people, you say "it looks like ___". For example, if you're waiting for some people to meet you but they're 15 minutes late, you can say:
It looks like they're not coming.
If you look outside on a rainy day and it's not raining anymore, you can say:
It looks like the rain has stopped.
In casual speech, you can leave the word "it" out at the beginning of the sentence.