First we draw the birthday candles on the cake, as shown in the picture:

Below the birthday candles we draw the outline of the top layer of cake, as shown in the picture:

And then on top of this layer of cake and then draw the cake oil on the cake, as shown in the picture:

Below the layer of cake we draw the second layer of cake, and then draw the cake oil on the cake. cake oil on the cake, as shown in the picture:

Finally in this layer of cake below the third layer of cake, and then in this layer of cake oil on the cake in, so that our three-layer cake is painted as shown in the picture: