My upper lip is on the thinner side; would lip fillers look natural?

My upper lip has always been much thinner than my lower lip, so it bothers me that it looks even thinner when I smile or take photos from the front. It is a bit disappointing that my upper lip doesn't stand out even when I apply dark lipstick.

So I am considering getting lip fillers, but I don't want it to look too obvious or become excessively plump. Rather than looking like I've had fillers, I would like just a slight volume in my upper lip to look natural, like someone with naturally beautiful lips.

I searched online and found that some people use the full 1cc, while others say about 0.5cc is sufficient, so I'm not sure which is correct. For someone with a thin upper lip, what dosage do you generally recommend?

If anyone has received lip fillers because their upper lip is thin like mine, how satisfied were you? I would be very grateful if you could let me know how long the effects lasted, whether the pain was severe, and if you have any tips on the procedure or recommendations for clinics that do a good job of creating natural-looking results.