After reading this thread, I decided to do a bit more research and I ended up getting a colour analysis done through a website I found.
I took a bunch of photos of myself (with and without makeup, in natural and artificial light) and submitted them along with a completed questionaire. The results are that I am a Soft Autumn (more specifially a Soft Autumn Toned, according to the 16-colour system). I also recevied an eBook which explains the process of colour analysis and colour charts for all 16 season possibilities.
It's very intriguing, and I'll keep some of the things I learned in mind when I go shopping for makeup and clothes in the future.