Yikes! Hopefully you realized something is off with the image on the left.
Yet, when we draw, many of us start with the eyes, making them too large for the head . So it's best to start with the head shape, divide it up into proper proportions and THEN put the features in the right places with the right sizes.
Check out the measurements to see where to put features and how big they should be.
https://www.youtube.com/watch?v=1kHzAh9sCH4&feature=emb_logo