Asian thick male hair black brown 22 inches

I’m 25 and started growing my hair in 2019. I used nourishing and strengthening shampoos and conditioners from Elseve, Pantene. The hair has never been dyed or cut (not straightened). I did not use irons or hair dryers, just natural drying. I rarely drink alcohol, 2 times a year. I don’t smoke, I use a vape. Like many people there is stress in life, so I’ll be honest, I have a few gray hairs. I take care of my hair, comb it and do not use dyes, irons, or hair dryers.
the hair predominantly appears black, but in the sun there is a glimmer of brown. I don’t know exactly what it’s called, but I chose brown. you can look at the photo
I had to submit the photo size, the quality may be worse, but I can send the images in full quality if necessary