Either you mouths are too low, or your nose is too high. However for fear of being wrong I'll try and link you a video that helped me when first starting out(It's more manga than anatomically correct, but it gets the job done for now). But as far as beginners go I think your off to a good start and it's good to see you have a plan. Also try being a little thinner with the strands of hair, add some variety to it. But mainly take a loo at how others draw the head and see if you can learn anything from them.
I hope this helps.