re: Teach a man to Fish (Fark Board Beginner Questions)

Here is how I would do it:
1. Cut out Richt's face.
2. Paste it in a new layer over Alfred. Play with the size until it looks about right for the facial features.
3. Use the techniques previously desribed to match Richt's skin tone to Alfred's. It's pretty close already.
4. Now blend the edges of the Richt head so there is no seem. In photoshop, you should have an opacity brush. In Paint.net, you would have to use the gradient tool, set to transparency mode.
5. In another layer, zoom in very close on Rich's mouth. Add a blacked-out tooth using the paintbrush. Blend those edges so it isn't just black pixels.

That should do it.

Now, you're wondering why it doesn't look exactly like the Obama image you provided; well, an artist actually drew that cover. If you want to know how to do that, you are above my talent level.