12 Sept 2017, 13:44

I also think the original faces were fine. When you are working with a stylized look like you are here it gives you a lot of latitude. Take a day off from this image and come back to it. You will see it looks fine.

If at that point you are still struggling, add a layer on top and do some structure drawings. That means mapping a center line through the head and also adding eye, nose, and mouth lines that wrap around that structure (like they do in animation). From there it should be easy to change anything you want. ; )