In one sentence, describe what the following article is about:

As with the rest of the body, the tongue and nose can be broken down into larger planes to plan out the form. Once you have them looking as if light is shining on them, go in with even finer details. To make the snout look wet, look at your reference for the placement of small, bright, hard highlights. These are called “specular reflections”. They occur where the light source is being completely reflected off the surface. Note that the “white” of the eye is rarely white under normal lighting conditions because it is recessed into the head and cast into shadow by the skin around it. Capturing these shadows is the key to making the eye appear to be set in the face and not just painted on the surface. Small, bright specular highlights give the eye a glassy sparkle. The ears are composed of a few large planes that turn up at the edges. Be sure to establish the forms before adding graphic elements like spots, and remember that the spots are affected by the light and shadow of the plane they are on as well.

Summary:
Add detail to the nose and mouth. Add detail to the eyes. Add detail to the ears. Continue adding details until you're satisfied with the results.