Song of Solomon 1 and 2 begin a difficult book to interpret. It definitely uses imagery related to the intimate relationship between a man and a woman within the bonds of marriage. Many believe that these are metaphors for the relationship God has with the faithful, and from the Christian perspective the relationship between Jesus and the Church. You may recall that Jesus is described as the bridegroom and the Church as the bride in several New Testament passages. Those metaphors most likely came from this book.
In this first chapter the woman recognizes that she is not expected to be a suitable bride for the king. She has not led the kind of life that is suitable, and yet he has sought her out, chosen her and has made her beautiful. He believes she is beautiful to his eyes.
We do not lead suitable lives to be in relationship with our God and yet God has sought us out. We have been chosen. We have been made suitable by His grace and we are beautiful in His sight.
Psalms 97 and 98 picture the Lord as King. He is on His throne. He is victorious in battle. All creation sings His praises. Those who worship other gods are put to shame.