Вопрос:

Какая смысловая разница между:

1. She looks like the type of girl who could be a pop star.
2. She looks as cute as a Barbie doll.
3. She looks as if she hasn't had a good night's sleeps for weeks.
4. She looks as though she hasn't had a good night's sleeps for weeks.
5. She looks as if she hadn't a good night's sleeps for weeks.
6. She looks as if she were ill.
7. She looks as if she was ill.
?