How to use "thoughtful" in a sentence

When he felt that they were near him, he looked up and saw that the girl was looking steadily at him with a soft, thoughtful gaze that made him tremble from head to foot.

Gran looked thoughtful

She was looking thoughtful

He seemed like the old Cham: thoughtful, kind

Because I was never in the room with both partners, getting a thoughtful response to a story note I'd given was impossible, because neither could speak for the other and could only promise to consult when next they met at the deathbed of whatever beloved person expired that week.

'Not Lettice.' Miss Marple seemed thoughtful