Those who have a strong colour sense can probably go by their own impulses. But I had my colours "done" even though I think I'm pretty good on colour, and I found it an interesting and useful experience.
First of all, it's even hard for trained professionals, sometimes, because so many variables come into play. The system is based mainly on skin tone and eye colour. To be really strict about picking your "season" you need to get your hair off your face and covered. But then again, hair colour DOES influence what looks best on us. And skin can be more or less tan, depending on the season and our use of sunscreen and time outdoors (or not). Or we might look paler due to recent illness.
The person who pegged me had a really tough time. When I first came in (sans makeup but with a light tan) and some rather too-coppery highlights, she thought I might be autumn. Then she put yellow next to my skin and we both almost threw up!
Then, given my low contrast appearance, she figured I might be a soft summer. But no. The softer, paler versions of summer's colours washed me totally out and I could take SOME of spring's bright, true tones pretty well (but not all). In the end she called me a cool summer, and gave me some colours from the cool wallet and some from the spring wallet (mostly turquoises and a clear red, which I can pull off). She also told me that I was right in my assumption that I can get away with some black; it's not ideal, but it's not as bad on me as it would be on a warmer complected pale-skinned person.
In an earlier thread on this some people said that your choice of decor colours often indicates your personal "season." But I prefer warm colours in my home. So that doesn't wash too well.
Kafe, it is really tough to tell from the pictures you've shown; you are looking for the skin's undertones, and how colours reflect against the face. Greenish veins usually indicate warm toned skin; blue veins a cooler look.
But you are probably a "soft" or "muted" and perhaps that is your dominant characteristic. Those people are hardest of all to classify. I am guessing you are on the cool side but I could be wrong.
Mo, are you usually a bit tanned in your photos? You might be a muted summer or autumn and can probably wear colours from both those seasons pretty well. Wow, you have such beautiful eyes, and they look so stunning with that shirt!