If you compare the KJV with the NASB you will notice that the “seemeth” (6440) of the KJV is marked by italics in the NASB. That means it is not in the Hebrew. I am not enough of a scholar to track this one down for sure but I found an indication. I have one translation called the Apostolic Bible Polyglot which is based on the Greek Septuagint. In consulting different translations the king’s men must have decided to go this way.
The word referenced in the KJV means face or appearance, which would fit in with the meaning. The basic point is made many times in Proverbs and other places in the Bible. One of the earliest is,
(1Sa 16:7 KJV) But the LORD said unto Samuel, Look not on his countenance, or on the height of his stature; because I have refused him: for the LORD seeth not as man seeth; for man looketh on the outward appearance, but the LORD looketh on the heart.So? God encourages our attempts to understand but demands obedience even when we do not.