The challenge for you as a painter is to successfully represent 3D objects on a 2D surface. One way to meet this challenge is with this knife-painting technique demonstrated by Carl Samson, who describes his methods for creating the portrait shown above. Authors says "Using the palette knife technique lets you quickly push the side plane behind the picture plane—without losing the structural integrity of the form with too much blending. Also, the palette knife allows you to freely paint the visual impression. The knife does the work for you by unifying and softening these receding planes without destroying their underlying structure."