Will .5 ml of Juvéderm Ultra make enough of a difference only looking to plump my top lip and define the bottom? (Photo)

The amount of product you are considering is quite conservative and will likely only result in a mild change.  I encourage you to discuss your treatment goals with your injector so that appropriate suggestions can be made.  The wonderful thing about Juvederm is that you can start slowly if that is your preference, and build until you achieve the look you want.

usually more is needed for volume and shaping. I suggest you see an expert, more can always be added.  Best, Dr. Emer.

Thank you for your question and pictures. How much filler you need depends on your goals. Your lips already have nice volume and shape. If you only want a subtle enhancement then you may be fine with just 0.5ml. You can always start with that amount and add more later if desired. Make sure you are under the care of an experienced physician injector and communicate your goals to them clearly. Hope this helps!