Long url, but look at the pictures of Henry VIII. The beardless one is of Henry in his teens, perhaps at the time he ascended the throne. The first one is a cushion from the portrait of Henry in the National Portrait Gallery. Some scholars say it was done in the mid 15 teens, other in the mid 1520s. The others are Henry after his last jousting accident in the mid 1530s. As he aged, he grew very fat.
I thought Burton was just on the right side of "heavy" for the role, but that his hair was too dark. Henry's had a reddish tinge. Other than that, he was made up and costumed well and I think he caught the character. Some reviewers said he was hamming, but Henry was not modest about his majesty. He was taller than most men at just over 6 feet. He was athletic and militaristic - an enthusiastic jouster and tennis player who loved to win a good match. He wearied his horses while hunting, and his courtiers said it was like purgatory to keep up with him. He composed music. He considered himself to be a very learned man, especially in theology. "When I pray, God answers. And let no man deny that." I think Burton's Henry said, and that's apparently how King Henry saw himself. "I am God's anointed. I am the greatest king of them all. So, I am always right." Henry was 34 or 35 when Anne came to his court from France, and 45 when he executed her. His body was turning from a young man's to an older one's. His vigor was slipping. His leg throbbed and he ate too much and took on more desk-work governing and less hunting and tennis since he got rid of Cardinal Wolsey. So he gained weight.