Is it possible to get fillers that look natural and undetectable?

If you look at before and after photos of fillers, there are cases where the changes are significant.

It seems there are cases where it is really natural.

So I am wondering if fillers are a procedure that is naturally noticeable.

I've noticed that there are some people around who look so natural you wouldn't even know they had it done.

Is there a significant difference depending on the dosage or the treatment area?

Since it is my first time, I do not want excessive changes.

I am also curious about which method is good if I prefer a natural look.

There is so much information that it actually makes it more confusing.