Go to Layer > New Adjustment Layer > Hue and Saturation. Place the new layer above the cat’s in the Layers palette. Select Layer > Create Clipping Mask. When you create a clipping mask the layer is visible only over the area of the layer below, in this case the cat. So select Colorize then increase the Hue to 235, reduce the Saturation to 23 and the Lightness to -15.
Again select Layer > New Adjustment Layer > Hue and Saturation, then go to Layer > Create Clipping Mask. Place this adjustment layer on top of the previous one. Change the Hue to 85, the Saturation to 60 and the Lightness to -35. This gives the piece a green colour.
Using the Paint Bucket (G), select the mask of the Hue and Saturation layer over the Layers palette. It will be white, so fill it with black to hide the green. With the Brush tool (B), select a soft white brush and white, then paint over the eyes and
also create green areas on the cat.
Now go to Layer > New Adjustment Layers > Gradient Map. This layer is on top of the other adjustment layers, and once again create a clipping mask. Change the blending mode to Soft Light. Set the layer’s blending mode to Soft Light too.