"Favour is deceitful, and beauty is vain; but a woman that feareth the Lord, she shall be praised."
Favour here seems to be the favour that a woman gets when she is beautiful. The Lord does not expect us to be ugly, in fact, He would rather us do what we can with the beauty He's given us, especially when it pleases our husbands. But the Lord reminds us (and men) here that any beauty that might be present on the outer body can be deceitful as to who the real person is, and that it will eventually disappear. There needs to be more substance to a person than what people see on the outside. If a man chooses his bride based on the outer, he has been deceived.
BUT! A woman that fears the Lord! There's REAL favour. A woman that fears the Lord is a real treasure. Ugly, pretty, short, fat, tall, skinny, whatever--the Lord looks on the heart. I suppose it's physically possible (though probably unlikely) that a woman could be a Proverbs 31 woman in every other way but in fearing the Lord. If fear of and a relationship with the Lord is what this otherwise wonderful woman lacks, then all the other things she does are of no worth. Because from the fear and love of the Lord comes all pure motives and "faith with feet". The only way we can be sure our works will not "burn" is to do them under the heading of "will this please the Lord?". I pray my sons will look for a woman such as this and that my girls will strive to be a "woman who fears the Lord" above all.