there many, many ways
to change the color of an Art Surface.
Here two of the easiest.
The first is to add a
"Hue/Saturation" adjustment layer. This is very quick
and easy but you will lose quite a few
of your details if your saturation is high
The second method is to add
a color balance adjustment layer
this allows for a lot more fine control
you can separately adjust
the shadows, midtones and highlights
Colour Balance is a little bit more difficult
to use, but the superior results
will reward you for your efforts