Hey there! Well done here! :) I made a few adjustments to the proportions of your drawing. The eyes were slightly misaligned. Remember that the tear duct should align with the wings of the nose. In your drawing, the eyes were shifted a bit too far to the right. I also defined the facial structure a bit more, including the nose, ears, and lips holding the pipe (I'd recommend looking at references to see how the pipe sits in these situations). We're not viewing the face completely from the front, so we shouldn't see as much hair on the left side. As a result, the ear on the right side should be slightly farther away from the eyes. To give the face more volume, you only need to draw a few lines that follow the direction of the forms. That's why it's important to keep the shape of things in mind. Hope this helps!