We already now that we are going to need 3 variations of the same color, close to 0 degrees, close to 90 degrees and 90 degrees, but the 90 degrees color is mostly because of the reflection, and to simulate the real world example we will need to add another color, the OVEREXPOSED, this one is going to generate a nice effect and a great blending, also this is the color that would help us when working with high end paint works like the Ferrari like SSS effect.

We already have the samples for the colors that we need, and for this process I used a multiplyDivide node. The multiply divide is going to help me to define the color variations, if I multiply by a number that is between 0 to 0.99 at the value of 1 the value is going to be the same and if its higher the value is going to be brighter. Just take into account that you need to set the 3 values the same amount to conserve the hue. Now lets see the connections.