“His left hand is under my head, And his right hand embraces me.” (Song of Solomon 2:6)

This is a description of the Groom embracing his bride, a picture depicting God’s love for humans...

It can also describe God as a Father, and fathers know when they carried their children as babys they often looked like what's described here: one hand under the head and another embracing 

“As a father pities his children, So the Lord pities those who fear Him.” (Psalms 103:13)

But God is promising to be Father to the fatherless, help to those who have none

“But You have seen, for You observe trouble and grief, To repay it by Your hand. The helpless commits himself to You; You are the helper of the fatherless.” (Psalms 10:14)

In His love, He holds our hands, walking us through life’s hills and valleys, like a father holding his child’s hands

“I taught Ephraim to walk, taking them by their arms; But they did not know that I healed them.” (Hosea 11:3)

Not only is His love promised now, but to the very end...

Even to your old age, I am He, And even to gray hairs I will carry you! I have made, and I will bear; Even I will carry, and will deliver you. (Isaiah 46:4)