These angels look sad for some reason, angels are not like people though, they are not given to emotion but to the obedience of God, Though the rejoice over sinners being saved and praise and worship, if they were to act on impulse, they would intervene on their own, and they cannot.
The Lord charges them and gives the, assignments. they follow His will and obey His Word, else they would be fallen too. God still gives people a free will. And your will is part of your soul, anlong with the mind and emotions.
The actual definition of angel is messenger. Do they deliver messages of course they do, look at Mary and Joseph as an example. Do they do that today? Yes, they still worf on the behalf of believers today, so ask God to send them to help you.
I always pray they will help find missing people or pets, protect children, do spiritual warfare or believers. And keep aways storms both spiritual and literal. It is good to plead the blood of Jesus over your home and family and angels to be on guard in His name.
The angel of the LORD encamps around those who fear him, and delivers them. Psalm 34:7
And now your servant says, ‘May the word of my lord the king secure my inheritance, for my lord the king is like an angel of God in discerning good and evil. May the LORD your God be with you. 2:Samuel 14:17
Are they not all ministering spirits sent out to serve for the sake of those who are to inherit salvation? Hebrews 1:14
I do like the second verse because we need the Holy Spirit to give us discernment, because even though there are more angels to protect us, there are still demonic and deceptive spirits, so be careful what you read and study about angels and as the Holy Spirit for help.
And remember, angels are not emotional and cannot act on their own but at God’s command and in answer to our prayers. They have no reason to be sad. Perhaps these just have no assignment. Are these angels out of work, God needs to hear prayers and he will charge them. Let’s let angels work for us as believers. And not stand with folded wings.