Intro: CG stands for Computer Graphic, beacause the product looks like a Computer graphic. I use Photoshop Elements, so I don't know if it's the same for the other versions.
1: Open up PS(Photoshop) and make it 500px * 500px (if you want that size); and select the airbrush tool () and set it to size 5, any colour you want.
2: Draw a shape (for example a oval) and try make it nice...
3: Now to fill it in... choose a foreground colour, select the magic wand tool () and click the inside of your shape and select Edit>>Fill and change the Use to 'Foreground Colour'.
4: Now the facial features with size 5 again, using the airbrush.
5: Now save it! Go to File>>Save and select the folder you want to save it in, and name it a name eg CG.
You're Done!!!