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Hi everyone, 
 
I'm an amateur photographer trying to produce more consistent results from skin undertone tests using my smartphone camera, but I'm running into some frustrating issues with lighting. For example, I took photos of my face in natural window light in the morning, then again under my bedroom's warm incandescent bulb in the evening, and the perceived undertone changes completely! Sometimes my skin looks cool-toned, other times more warm or neutral, which obviously compromises any analysis I try to do. 
 
I've tried adjusting exposure and white balance settings on the phone manually, but the variation under different light sources is still too unpredictable. It feels like the camera's sensor alone can't always be relied upon without optimal lighting, which makes me wonder what kind of setup you all use for these tests. Is there a particular type of daylight simulation or color temperature I should target? Or specific angles or distances from the light source that help the camera better reproduce true skin tone? 
 
I've found some photography lighting guides focused on skin tone testing and color accuracy, such as  <a href=https://color-season.top>color analysis quiz</a> , but I'm still curious about hands-on, low-cost lighting hacks or setups that others might have found. For instance, would using a ring light with a diffuser make a meaningful difference, or is natural daylight near an indirect south-facing window still the superior option? Has anyone tinkered with affordable LED panels or even DIY solutions like using a white foam board to reflect light? 
 
Any examples or photos of your setups would be greatly appreciated. I'd love to hear from others who've managed to get more stable, camera-based undertone results that don't vary wildly based on the lighting circumstances. 
 
Thanks in advance!