Mate, please believe me when I say that mirrors, cameras (especially camera phones) and certain lights massively effect what we see. This is not the same as what the human eye sees in reality.
It is massively important to keep your hair short, even as a diffuse thinner. My honest opinion is that 2D Smp can never be truly undetectable next to 3D hair. I shave my head as smooth as I can with an electric shaver in the morning EVERY SINGLE DAY and by the time I leave work I have sandpaper stubble.
The most natural treatments are the light ones for me, don’t worry about what you saw today, just keep the hair short.
You know how dark and dense my treatment once was, well I could take camera pics in the sunshine that make me look complete bald but I know that’s not what ‘real people’ are seeing with their ‘real eyes’.