Then go to Filter >> Surface Blur, set Radius to 5 and Threshold to 5. And/or take blur tool and blur the sharpened and pixel-y areas, so skin looks clean and smooth.
Duplicate the base three times, set first two duplicated layers to Screen 100%, the third copy set to Soft Light 100% and Desaturate (Image >> Adjustments >> Desaturate or Shift+Ctrl+U).
Now the coloring part (Actually you can stop after any of these steps and get very nice coloring):
Add this gradient and set it to Hard Light 80%
Next add this gradient and set it to Multiply 100%
Next gradient, set it to Soft Light 100%
And the last one - set to Soft Light 100%
Next duplicate the base, drag it on top, desaturate and set to Soft Light 100%
Next add a selective color layer (Layer--->New Adjustment Layer--->Selective Color) and choose Blacks:
Set the black color to +15%
Then go to neutrals and set the yellow to -15%
This is what you got:
And this is what my Layer Palette looks like if you got confused:
Layer >> Flatten Image
Very nice add to icon is rounded border:
Make a selection 98x98 px
Select >> Modify >> Smooth
Set Sample Radius to 5 pixels
Next Copy your selection and past it on new 100x100 Transparent canvas.
Save it as *gif document and your done!