This looks good so far.
As I said to another who used a similar approach...I would recommend taking a look at sargent's and velasquez paintings to study the brush stroke directions that define structure, including the head and the neck. The light on the ears should describe the light direction and the planes as well. The light on the ears suggest the light is all hitting the same planar direction at the moment when the ears have a variety of top and side and bottom planes. Great job on massing in the shapes of the light and shadow overall.
Keep up the good work.