Light and dark

Shades are colors that have black added to them, tints are colors that have white added to them. Look at this hummingbird. The way how the green on the body and wings merges into the white breast feathers. Lovely. that light green is a tint of the green above its eyes. Look at the red under the beak. It has some parts with black added = shades of red.

When you think about it, light really affects thee way we see colors. Even in our natural every day world, its surprising we don't get a brain overload with all that's going on. I took some examples of the art building at uni. See how the color of the bricks are darker in the shade. That's because it has black added to it. Look at the top of the camera, it has a highlight, this is more white because of the sky's light. 

In fact, the sun is quite important in how we see color...actually, i'll talk about this later lol

Tints and shades in fashion

Usually in make up you would be using pure hues to make someone look beautiful. Unless its for some funky fashion shoot. Actually the red lip look is quite popular but that's about it really.

For like eye shadows and glitters you'd usually have tints and shades of broken colors and pure hues. They all tend to be not too far from natural skin tones. Again when it comes to make up, color theory is very important; using colors carefully to contrast and make others look dominant.

Again with blusher, the key is subtlety, that means tints and shades of pinks and browns and reds..harmonious colors actually. 

you don't wanna look like this douche below do you?  

Eye colours

Honestly speaking, I've seen some AMAZING naturally occurring colors in eyes of living beings. Obviously some people wear contacts but usually you can always tell if someones eyes are real. Like this guy below you can see the green edge and brown center - gorgeous mixture - known as hazel eyes.

As brown is derived from red a green, these eyes have a large scope of broken colors.

 I could sit here at my laptop and take a sample of almost every colour in the iris here but thats long...

Anyways, Animals have beautiful eye colors too. There are eye colours which animals have which humans cant. For example, this Red eyed tree frog. Never seen someone who's not wearing contacts have this XD

You do see people with eyes like lions but its so rare. My friend has this eye color but because we have pupils, the color of the iris gets darker as it gets to the pupil. In terms of color theory adding black to a pure hue color makes it a shade.

But here my favorite dog, Husky!!! Eyes to dye for. Brown and blue, i think these colors are actually complementary - they are derived from orange and blue but they are tints