What a lot of people dont understand that hair color looks different in different lighting and it can make ALL the difference. A lot of my clients hate the color red but you need to understand that when the light hits it there will always be some sort of red. I think my inspiration Guy Tang says it best :

I find it very fusturating finding the perfect lighting. Sometimes I admit I have to edit the color to what I think looks more like indoor hair color. But it is better now with the iphone. =D

This is my verison of it. Yesterday I did a Mocha brown hair color. It looks more like the indoor color but outdoors with the sun shining right on it.. The base color appears a lot more of a red brown.