The Lord tells David that He will guide him “with His eye”. God might give him a warning look, a warming look or a welcoming look.
Psalm 32:8 I will instruct thee and teach thee in the way which thou shalt go: I will guide thee with mine eye.
Just as some married couples become so close that a simple look speaks volumes -- believers can be so close to the Lord that they are lead by Him in all areas of life.
A close relationship with God requires a humble and yielded heart, ready and willing to do as He asks.
Keep your eyes on Jesus through His Word, and He will keep His eye on you, ever leading you to righteousness for His glory (Psa. 37:23).