How to use "impression" in a sentence

I learned to trust my first impression of people.

I decided that my first impression of Mr Slinkton was wrong.

She had, the impression he was over forty and perhaps foreign.

Mrs Darrell did not see his face, so her impression that he was a darklooking foreigner aged over forty is not certain.

The Martians had made such an impression on me that at first I did not think I could escape