Simon looked around at the bigger house with an alert eye.

The woman's deep, dark and alert eyes responded to his gaze.

He had seen something outside that made his alert eyes gleam.

I saw the alert eyes of a young girl about ten years old.

The horse has a slightly long head but alert eyes and ears.

But his alert eyes couldn't restrain themselves from making sure.

He glanced up at Art with alert, dark brown eyes and grinned.

He was seen by a man with suspiciously alert eyes.

He had quick, alert eyes that seemed to focus on nothing and everything all at once.

I had to turn my back on Henderson's alert eyes.