The children's work time is very focused. They always put a lot of care into what they do.
Always try to remember this as you verbally discuss their work. Some things to say might be:
"I see that you used black and white ; that's beautiful !" or"I see that you drew circles"\
Try to avoid"What is it?" and always treat their work with respect.
You might wait to see how they respond before saying anything else. Let them guide you.
Even the smallest piece has more work and thought than you might guess.