The Book Of Fundamentals

[Nestergen]

Hey dude, I wanted to try the bridgeman method for myself and help you out as well.

I didn't go off the reference, I just did some random face.  I've marked the areas in red where you should look at the differences to see where I think your proportion, placement and measurement is off.  

I think there is some perspective distortion in your piece due to the camera angle so I can't tell exactly, but the head shape seems a bit too pointy at the top of the cranium.
The ears are too low (they should align with the bottom of the nose. and a bit too large.

 In general I think the placement and size of your eyes is throwing off the face. Also the eyes are a bit too narrow and close together (should be 3 equal eye widths from the left eye outer corner to the right eye outer corner). 

This might not be bridgeman but the corners of the mouth tend to align with the center of the pupils.
Hope it is useful.

Thank you so much :)