1. Her eyes: The way she looks at me whenever we talk/chatter. Everything is in the eyes. If a woman's paying attention to whatever I'm saying, her eyes can never lie if I'm boring her or not.
2. Her Smile/Sound of Laughter: I'm a humorous fellow, and one easy way to know how engaging a girl might be is from the way she laughs.
3. Body language: She may not mean what she's saying, but her body, just like her eyes, won't lie to me.
4. Walk: According to Prince - 'It's about that walk!'