He sat silently for a moment, a slight frown on his face.

Bishop looked up from his computer with a slight frown.

She put her head on one side and looked at me with a slight frown.

He gets to the end of the post and looks at me with a slight frown.

He paused a moment and looked at the back of his hand with a slight frown.

When I turned she was watching me closely, a slight frown on her face.

Going by the slight frowns he got in return, the smile hadn't been that successful.

He looked down at the map, a slight frown on his face.

He stood thinking, a slight frown on his face, then nodded.

He examined it quickly, a slight frown on his face.