Here is one of my Head Studies!
Notice the dog on the left has a really good Head Type, with plenty of front and back skull, good shaped muzzle, and cut of lip. Also notice the dog on the left Neck, and the width of the Top of his Head.
Now, compare that dog to the dog on the right. Even though the Head Type of the dog on the right has become accepted more every year, he is completely Over Done and does not have Correct Head Type as per the Breed Standard. He does not have good front or back skull, nor does he have cheek bone, his muzzle is way too large compared to the size of his head, or skull. His neck is not set well, he has Pendant Lip, and has too large a ears, which gives a Hound dog appearance, his eyes can not be seen, for all the Wrinkles and he has the Wrinkle Factor. His nose must stick up in the air due to the fact his head is so out of balance and so heavy for the size of his neck, this is the only way he can carry his head. The length of his muzzle is way too short, yet way too deep. Totally out of balance for a good St. Bernard Head. This type head has absolutely too many faults or short-comings, to ever be considered good or with good Head Type. His skull is domed and his muzzle is arched. This is what is called Extremely Over Done.