Is it possible to tell someone is in love with you by the way they look at you?

I believe it is quite possible to tell that somebody likes you by the way they look at you. Like, if not love.
If they don't make eye contact that much or they tend to look down towards the ground there is a possibility that they may actually be shy. If they look at you and avert their gaze smiling, this could also be an indication of likeness.
Smiling, warm, welcoming eyes is also an indication. Plus, you can feel a bond between the two of you if it's a mutual feeling. That's what I believe.

I don't think thats enough to tell..der could be other signs as well..

If they can't  sit still when their by you yeah guys seem to show it more