Most Helpful Guy
Face. At my worst, I'm just making sure she won't notice me checking her out. When I examine a face, I notice how she holds her jaw, how observant her eyes are, and how she holds her head. I'm assuming we aren't making eye contact.
After that, I observe posture and clothing. You can tell a lot about a person by those two. Posture and stride are very telling. With clothes, it's more than what brand or how much skin is displayed. Color choice, quality (ironed, clean, worn out), how it rests on their body, style, everything gives you a hint of who they are.