Decide on scale (the head very small) and we will begin. Draw two eyes very small far away from each other, then a nose and an open mouth. Further teeth, lip and ears.

Make fluffy the head.

Draw a skeleton of wings, i.e. elbow part and fingers of a bat.

We draw membranes, a body (the small part from above of the head is seen), a foot and a tail.

It is possible to put a few lines for allocation of dark sites and a relief of wings.