Your portfolio book is what sells you, it says what you are capable of and what you should be booked for. Put together only the best shots you have and if you aren't certain about a shot then don't include it. Confide in friends and agents, and listen carefully but also listen mostly to what is inside of your mind. If the image doesn't sell more than your pretty face, then it isn't selling. Focus on putting some personality, and a story into your shots. Because what you show off, is an example of what you are seeking and where you are going.
Modeling isn't an ego or beauty thing, it is also a marketing thing.