It's looking really good for a beginner. I'm not confortable with lascaux, so good for you for getting the hang of it. The only problems I see are the eyes, which could benefit from symmetry, and the neck, which needs to be much thicker. Next time, when you draw the face, lay down a few lines to indicate the centre of the face, and the eye level, etc.
It would really help in getting them even and the same size. As for the neck, just make it wider and it will look just fine.