I swear by this book. I know my season and I am constantly trying to figure out others! This has a page for each season with all of the makeup colors they can wear, SUPER helpful! I scanned a copy of my seasons colors and I take it to the mall whenever I go!
This has a lot of timeless tips for makeup color choices and application. I was a Mary Kay consultant and this helped me decide on the placement and colors of different makeup based on skin tone and hair color.