Skin tone is the surface skin color - whether you have pale, light or dark skin. Skin undertone is the subtle hue underneath the surface - I think what you're wanting to find out is your undertone - whether warm, cool or neutral. If you're veins will look green, it means you have a warm undertone. If it's blue or purplish, it means you have a cool undertone. My veins appear green and some purple so mine I have a neutral undertone. Looking at the picture, If i'm not mistaken, I'm seeing green which means you have a warm undertone.