The video shows a person drawing a glass of water on a white surface. The glass is filled with water up to the halfway mark and has a straw in it. The person starts by drawing the outline of the glass and then proceeds to add details such as the reflection of the glass on the surface and the shadow of the glass. The person uses a pencil to draw the glass and its reflection, and a black marker to add the shadow. The drawing is realistic and detailed, with attention to the light and shadow effects.