Thanks for reading and taking the time to share your experiences, Lamia! You ask a good question about the "place" the color "should" be seen. In my experience, sometimes the colors DO correlate with their "correct" chakra, but sometimes -- especially in the case of purple -- they're seen throughout the body, and that's actually fine. See more about that with purple here: https://drawingsof.com/purple-aura-meaning/
Regarding the disturbing faces, I would encourage you (if it's not too upsetting) to allow yourself to really look at and engage with those images as they pop up -- ideally with the help of an energy worker by your side who can support the journey. Resisting and trying to shut out images can often cause them to persist, while actually being with them to understand their messages is what can help work through them to get to a positive new state. Journaling, therapy, exercise, and talking with trusted people can also help get them out of your system, but as always, listen to your body about what feels like a match for what's needed. Sending you good energy!