I was wondering the same thing. But have a hard time deciding if I'm cool or warm toned. I've always thought I was an NC, but I'm not sure! lol
From the pictures you've posted, you seem a little more on the NW side - actually you have the sort of skin I had when I was younger - I was just totally white/neutral.
The rule of thumb I use is that the more yellow your skin, the more dirty cast to the color will come out and the more red, the more pink and clear color cast will come out BUT the darker your skin and lips are, the lighter the color will look (which also accentuates the cooler, bluer aspect) and the paler your skin, the darker (which is also the redder and browner). It's like a matrix, so you factor all four together. This is the color theory behind it. It sounds complicated, but it isn't really - just hard to describe with words. We'd have to do exercises where you mix colors in increments, like red + exactly half the amount of blue and go up and down in increments, then do the same with just white and black, then do 2 colors + white, 2 colors + black, color + the compliment of the color, etc. etc. I guarantee a day of that stuff and it gets burned into your brain!