The first things you notice about him are his hands.

Some people might not notice or care about the difference.

People around you may not notice anything different about your behavior.

But your hair was the first thing I noticed about you.

"Then go and ask them if they noticed anything wrong about their air!"

But what I did notice about him was how much he wanted to love women.

Have you given workers enough notice about the new policy?

They say that what people notice first about you is your eyes.

Matter of fact, I didn't notice her about last night.

That's something I usually notice right away about a room.