How much filler do I need? (Photo)

Generally, for mild to moderate volume loss, 1-2 syringes of hyaluronic acid filler per cheek may be sufficient. However, for more significant volume loss, it may require 2-4 syringes per cheek. Please note that these are only rough estimates and the actual amount can only be determined after a thorough physical examination and discussion of your aesthetic goals.In some cases, it may be beneficial to start with a conservative amount and then add more if needed at a follow-up appointment. This approach can help to ensure a natural-looking result and minimize potential side effects. 

It's very hard to tell with this extremely cropped photo. I assume you are talking about the submalar region hollowing but again cannot know for sure. If that is what you are bothered by, I would work on building up the zygoma first. Based on this very limited view, I can imagine you needing at least 2 syringes per side.