Start with a process, not one clue
Finding your season works best as a sequence: temperature first, then depth, then softness versus clarity. One clue on its own, like vein colour or how dark your hair is, can send you the wrong way. A repeatable process gives you stronger evidence and fewer false starts.
Step 1: Confirm temperature in steady light
Hold a clearly warm shade and a clearly cool one up near your face in indirect daylight. Keep makeup light, and move any strong colours in your clothing away from your neckline. The right temperature usually makes your skin look more even and your eyes look clearer within seconds.