When children draw, they reveal how they perceive the world and themselves. It is interesting to hear how they interpret the lines they draw. When children first want to draw, they draw lines, such as down, across, rainbow and circular. It is important that they can experiment and look at the shapes of the lines with curiosity.
Then they may decide that the lines look like something they know and name the drawing. They may start with an idea and because the lines look like something else to them, they then label it as something different. This is to be expected, and it shows that they are thinking and seeing similarities as well as approximations. Imagination is developing.
When they to the stage of drawing recognisable things, then is where we get to see stuff. Like when children draw people, to begin with, they draw them without tummy's. Just head with features, legs and arms. Gradually more features are added and the tummy as well.
Sometimes a person is drawn on their side and you could ask: "What does this mean?". Does the child see people as if on their sides? Maybe they turn the paper round after having drawn it, so it is right way up. Or if they don't, it could be an issue in perception and translation to drawing. Some children who have been born prematurely do this. Or a person is drawn upside down. Again, a perception issue. The brain needs to develop more to get the positioning right. Maybe the child also has difficulty with building blocks with gaps between them showing an issue with spatiality. Or you may notice some things about orientation in other situations, e.g. looking at books upside down
If they do draw the person right way up but leave off features, maybe they are not yet aware of those details.
Sometimes a child will draw the features of a face but no lines showing the edge of the head. Or the features may be in odd places. These also show issues with perception, spatiality and orientation.