your 3 drawings here look great. The only thing that stands out to me at first glance is the one on the right, the ears seem to be in the wrong spot, but that's easy to mess up, i do it a lot. The top of the ear lines up with the top of the eyebrow, where it connects to the face at the top of the ear lines up with the corner of the eye, and the bottom lines up with the bottom of the nose. Mind you, if you're drawing ears like what your first 2 drawings have they could really be just about anywhere, Generally I try to center mine around where the ear canal should be since it has to go through bone structure.
One thing that clicked in my head when I heard it watching a video, can't recall who said it now, was to make sure all the pieces of the face are facing the same direction. Taking pictures of your own face at different angles to see how the nose and eyes and things look at different angles together could help.