Hey! Nice work here. The main issue is the orientation and angle of the jaw. In most of these, we’re not actually seeing the face from below. Instead, many of the heads are at a neutral level or slightly from a higher angle, so we wouldn’t see the underside of the head. This can be a bit tricky, but you need to pay attention to the orientation of the head—how much it’s tilted forward or backward. If it’s difficult, try drawing the curve over your reference to better understand the head’s angle. This is especially helpful in those mid-angle cases, where the brow line might curve upward while the nose line stays almost straight. There are also clearer examples, like the top two images, where you can clearly see the downward curve due to the top-down view of the head. Another way to think about it is to treat the head like a box—this will give you a clearer sense of perspective and, therefore, the angle. Hope this helps!
