Natural is ideal, but if you have dyed hair your colouring also inevitably changes, even if the colour suits you well.
As an example, my natural colour is a very ashy, very dark brown, often mistaken for black and I used to dye my hair medium auburn/ginger, which suited me very well and most people had no idea I wasn't a natural redhead.
What suits me now are very deep, dark colours. When I was ginger, what I wear now looked okay, but I was suddenly also able to pull off vibrant True Autumn colours and those actually suited me best. I looked like a Christmas tree 24/7, and it looked great. Now it'd probably wash me out.>>1491
Idk, I've never had that experience even though I fit that description, so the website must've been faulty. Also, you don't really need to focus on your hair and eyes but the overall picture.
As for what I promised, here's how I did it:
-Stand in front of a full-length mirror, in natural, neutral daylight (so not too sunny and not too gloomy and overcast)>Make sure the room you're in doesn't have any overwhelming colours (so, no bubblegum pink, purple or blue walls, etc)
-Preferably move the mirror in front of a window, so that you're facing the window, and the mirror faces you
-Pin hair back or to the side of your head (should be visible but not overwhelm your face)
-Wear as little clothing as possible on top, a nude or grey vest or just your bra or whatever you have lying around
-You probably already have some ballpark idea of which colours look good on you, so start trying those on by covering your upper torso with fabric in each colour the best you can, or holding a piece of clothing under your chin and against your face.
-Alternatively, go to http://www.truth-is-beauty.com/color-analysis-quiz.html
and answer the questions, or better yet have someone answer them for you. Your result will most likely not be accurate, but it'll still give you a direction to head in.
-Try on a bunch of different colours, even if they look very similar, even if they're part of the same colour family (ie lime green vs sage). Everything. Use bedsheets, your bf/mum/dad's clothes, your own, household linens, sometimes even large objects like big books or cushions. Go wild, it'll look silly. Patterned fabric can also be useful in small quantities.
-Write down what you find on a piece of paper. Example: Denim blue > maybe, Navy blue > no, baby blue > yes. You'll know you've found a colour that looks good with your complexion when it makes your face 'pop' all of a sudden. Don't think too much about it for now, you'll know it when you see it. It's also a sliding scale, so you will have things that look 'okay' or 'pretty good I guess' or 'meh', not just 'hell yes' or 'hell no'. Just write everything down.
-Get another piece of paper and ask someone else to evaluate you for all the same stuff. Some of their opinions will probably differ.
-Finally, try different makeup in the same conditions (so, no Sephora). Eyeshadow palettes work well here. Again, write everything down.
-Open MS Paint or photoshop and compile a list of the colours that look good and those that look just 'okay'. Compare and contrast with each season (you can use the website I linked) to find where you belong. Even if it's not any one season, you'll probably have a much better idea of what suits you now.
-The same lady from the link also has pinterest boards for each season. Check those out.
-Also, you'll probably never match any season perfectly. This is fine, few people do. We can't be put into any one exclusive box, but we're not meant to either. It's just to give you an overall idea of what you should strive towards, it's not a rule by any means.
You've essentially done your own at-home draping. This is more or less what they do, except they have fabric swatches.