Now your child has reached the schematic phase when drawing pictures, i.e. he or she will incorporate their personal knowledge into their pictures. Thus, you may see a house from the outside while nonetheless being able to take a closer look at its individual rooms inside. These so-called x-ray pictures show that your child has an idea of the house and its premises.
In most cases your child will not render reality in its true proportions - the latter only indicate the level of significance of a person or object and the message kids want to convey. As a consequence, your child will probably draw his or her much beloved granny larger than a tree in her garden. Moreover, a typical feature of this development stage is that persons are drawn with exemplary details for the purpose of differentiation and recognition - which is why granny is wearing large glasses.