I recently painted this set of doors and windows to look like mahogany wood.  On the inside they looked like a honey oak color and on the outside the door trim and window trim was white and the rest was the house colors.

Here in this first picture you can see how I go about this sort of project.  I first sand every surface to be painted with a 150 grit sandpaper.  All I want is to scuff sand the surface to break up the smooth skin of the finish that is on there.  Then I prime all the surfaces to be painted and then I apply a basecoat paint.  For mahogany I use a Sherwin-Williams color called Tatami Tan.

Here's a shot of the whole wall.  I have the pieces primed at this point and the window on the right basecoated.

The view from the outside.

The finished look on the inside.  After I finish the painting I apply 2 coats of a clear sealer.