Ahh, that's the million dollar question...how to avoid the duck look or otherwise unattractive lips after Lip Augmentation. This is not the problem of using any one filler or method of Lip Enhancement but rather a lack of knowledge of the proper aesthetics of the lips as outlined in my new book on the subject. There's a perfect size and proportion to the lips that if acheived using Alloderm, Restylane or Juvederm, the lips are aesthetically attractive. If this proportion is violated, the liops appear ducky, to large and often distorted.
You, as the consumer, should learn what does and does not constitute beauty when it comes to plastic and cosmetic surgery procedures and treatments, including Lip Augmentation as this is something not taught to doctors and surgeons during their training...and therefore not common knowledge.