Artist Kid / What It Is Actually For
What to ask when you cannot tell what it is.
There is a whole conversation available that does not require the child to name anything.
The honest problem is that adults want to say something warm and the only phrase to hand is a question about subject matter. What is it, is it a dog, is that Mum. Each of these asks the child to convert an activity into a label, and if there is no label the child will invent one to satisfy you. Once they learn that a label is the price of your attention, they start deciding on the label first and then making the picture fit it, which is a narrower and more anxious way to work than the one they had before you interrupted.
The replacement is description. Name the physical facts of the sheet without attaching a value to them. That red goes right through the middle. You have covered the whole thing this time. There is a lot going on in this corner and almost nothing over here. These lines are thin and those are fat. It sounds mechanical written down and it does not sound mechanical out loud, because it is unmistakably the sound of someone who has actually looked. Children can tell the difference between being looked at and being praised on autopilot, and they respond to the first.
If you want to go further, ask about the doing rather than the meaning. Which part did you do first. Did that take a long time. How did you get it to go that dark. Was that hard to do. These questions are answerable, they treat the child as the expert on their own process, and they invite them to reflect on method, which is the thing that will actually develop. What they should never become is an interrogation about what the drawing shows or what the child was feeling. Reading meaning or mood out of a child's picture is not something an adult should attempt, and asking leading questions in that direction is a poor idea however gently it is done.