Hello! Thank you for your question and for sharing your photograph. From looking at your photographs, it seems to me that the right side of your mouth is slightly smaller than the left side, making the lips on the right appear less full - which is most likely what is causing the asymmetry that you are seeing. This is genetic, and very common. Most people (including myself) have one side of their face that is slightly smaller, the same way that most people have feet that are slightly different sizes. I tell my patients that the sides of our faces are sisters, not twins. If this is troubling to you - a filler such as Juvederm can even the two sides out. This is actually a very simple procedure (which I have had myself), taking about 15-20 minutes to preform, and results last about 9 months to a year. I hope this helps, and good luck!