Is it possible to achieve natural changes with fillers?

As I get older, I feel like my facial volume isn't what it used to be, so I am looking into fillers.
However, I'm worried that fillers might drastically change my appearance, so I can't easily make a decision.

I'm looking for just a slightly more vibrant look rather than a noticeable change, so I'm curious to know what the results were for those who have actually received it.
I would like to know if it was noticeable to those around you right away, or if it was a natural change that only you could feel.

Please let me know if there was anything you were most concerned about when you first received it, or if there was a specific direction you requested during the consultation.