1、He had his hat tucked under one arm and wore a grim scowl on his face.

2、He carefully observed the shrug of one man's shoulders, the position of another's hands, the scowl on one face and the frown on another.

3、The scowl on his face is not meant to be fierce; it's because of how he scrunches up his nose to keep water out.

4、With a novelist’s interest in detail, he carefully observed the shrug of one man’s shoulders, the position of another’s hands, the scowl on one face and the frown on yet one more.