There are two basic skin tone types: warm (yellow undertones) and cool (pink undertones). Veins on wrist, elbows, and temples indicate skin tone. White paper test shows blue/pink for cool, green/gold for warm skin
Eye color is determined by iris pigmentation and collagen fibers. Main genes include OCA2, HERC2, and SLC24A4. Blue eyes are becoming rarer due to intermarriage
Calculator helps determine product usage based on user's makeup habits. Nicole Skyes' research inspired calculator for mascara, lipstick, and foundation
Face shape is determined by forehead, cheeks, jawline and overall length. Oval face has widest forehead and longer face length. Heart face has widest forehead and pointed chin. Round face has widest cheeks and softer jawline. Square face has wide cheeks and strong angular jawline
Face width equals length, creating balanced and symmetrical appearance. Features soft, circular silhouette without sharp angles. Has pronounced cheekbones and fuller cheeks. Jawline maintains rounded shape without pointy edges
Olive skin is naturally neutral and less orange than tan. It rarely burns and tans easily. Has a slightly green undertone that ranges from cooler to warmer