Those lines are just guides to help keep things proportional. It’s OK to deviate from them if you feel like it makes a character look better. Is your goal to draw realistic or draw a stylized cartoon?
I will also recommend you look up Persepolis by Marjane Satrapi. Her art is very similar where characters have very round heads. There is also an animated film so you can see how characters who are stylized like that move.
I would also recommend just drawing the characters multiple times. It’s weird that you still have the same images from July as examples.