How do you use a palette when choosing hair color?

I tried taking a few phone photos to understand my undertone before changing my hair color. The same face looks warmer by a window in the evening and cooler under a bright bathroom light. The shifting colors make a neat online result hard to trust on its own. My natural hair is light brown, and I am considering a subtle change rather than a dramatic one. I found <a href=https://choosehairstyle.top>skin tone analysis</a> while looking for a way to compare images, but I still need a sensible way to use the information. I want a shade that works in normal daylight rather than one that looks good only on a phone screen. I can take pictures with the same plain background, no beauty filter, and my hair pulled away from my face. Would indirect daylight and a neutral shirt make comparisons more consistent? I am also thinking of holding a few fabric colors near my face rather than deciding from a single photograph. At the appointment, real hair swatches could be checked beside my skin and roots. That would give us something concrete to discuss instead of trying to prove that an app assigned the right season. Leaving the pictures unfiltered should make the comparison more honest. For anyone who has had conflicting photo results, what helped you choose between a neutral and a cooler shade?