Ok - you are on the right track then. What you need to do is to get a selection of tee shirts, blouses, scarves out. You have to do this in day light. No make up, to begin with.
In front of a large mirror, in a good light, hold each garment in front of you, up to your chin, and observe how the colour reflects onto your face.
Look at the shape of you face, especially under your jaw line.
Look at the colour of your lips - YOUR colours will increase/bring out the colour of your lips. The wrong colours will "drain" your lips.
The right colours will fade the shadows under your eyes, the wrong ones will exaggerate them.
The right colours will fade out lines and wrinkles, the wrong colours will increase them.
My guess is that yellows, golds, browns with a yellow tone, orange, autumn colours will be unflattering.
Soft pinks, greys, blues, violets, plums and navy will be flattering.
Once you get the right family of colours, you look for other colours that harmonise with them, and don't clash.
It really is that simple. Then, you choose make up in the same family of colours.
Sorry - I live in london, so can't show you. I do know a lovely lady in Bristol though, who does colour analysis.