Here is a tut on changing the color of an object in photoshop
ex a car skin color hair color ect anything really

1.) open the image with the object you would like to change the color of for this tut i will be using a person and changing their hair color

2.) So after the image is open go to layer>new fill layer>solid color change the opacity to around 35% and press ok then just change the color of your image you should end up with something like this

3.) when your done with this go over the the layer pallet and make shure that your new fill layer layer is selected then start erasing around your image that you want to color (to zoom in and out press ctrl + at the same time – for zooming out and the [ and ] to change brush size) when you are dome with this it should look something like this (and remember you can pick any color) and dont wory if you dont get the edges 100% perfect (its better to make them go a little over then not enough but still try your best) when done it should look about like this

4.) the final step to do this is that you will need to go to filter>blur>gausian blur set this anywhere from around 3 to wherever you need it to make the hair look better (more gausian blur if the color is going over the hair more or whatever object) and here is the final result with gusian blurs and stuff like that
Before
After