There are many ways of doing this. My very first attempt entailed using a mirror in the bathroom with a white sheet over the shower curtain behind me to act as a white background, and a dim light for the check. Eventually the relaxed focus became possible and the steamy vapor of the innermost level became visible.
But I needed a little more validation than that. I knew people who could see auras, of others anyway, in bright colors, and a tenuous vapor that could have been due to eye fatigue didn’t seem too much of an achievement.