While some people believe that the upper lip should be slightly larger than the lower lip, others argue that a more balanced approach gives a more natural look. Ultimately, the best proportion will vary from person to person, depending on their individual facial features. However, most experts agree that a ratio of around 60:40 is generally flattering for most face shapes. So if you’re considering lip fillers, this is a good starting point. ultimately, it’s up to you to decide what looks best for you.