The eyes are the windows to the soul, or so they say, and it certainly is an affective way to convey a sense of immediate intimacy with your viewer.
It is important, however, to remember that it isn't the only way. Sometimes it's nice to step back and use other elements of your photo to help your audience explore whatever emotion you are trying to convey.
Such as contemplation~
Play with finding different feelings in your own photographs. Close up portraits, beautiful eyes, and haunting stares are always nice, but when you step back a little you tell more of a story. Because, after all, a picture is supposed to be worth a thousand words.