Apply a coat of primer and let it dry. Apply base coat and let that dry. Sand the door's surface lightly and remove the dust with a damp rag between layers.
In separate containers, mix one part of each wood-toned color with one part water and one part glaze.
It's important to paint in the direction of the wood grain so tape-off the horizontal (including mitered) edges of the trim. Make sure to push the tape down really well so paint doesn't bleed underneath.
Wood graining is actually the strie technique with a new step added. Apply a small amount of the lighter brown mixture as you would for strie with long, straight horizontal strokes. Some areas will be a little darker and some lighter, which is fine and enhances the natural feel of wood. Let dry.
For the second coat, apply a light, streaky coat of the darker brown mixture, and while it's still wet, drag and rock the wood-graining tool through it to create the knots and grain naturally found in wood. Use the edges of the tool to create different looks. If an area looks a little too dark, lightly sweep a dry brush over the paint. For areas the wood-graining tool won't fit into, use the dry brush to create a strie effect. If you want more of a challenge, use the artist brushes to create additional wood effects.
Once you're done wood graining in one direction, pull off the tape and let the door dry.
Repeat the process for the unpainted vertical sections of the door and let dry. Apply a coat of wax or varnish — work quickly, again going with the grain of the wood. Don't reapply the varnish in a wet area as that can gum up the surface. This layer will protect the finish and bring out the detail of the technique.