Preparation materials: a piece of drawing paper, black paintbrush.

Step 1, first of all, on the paper to draw the upper and lower two arcs, arc that is the body of the fish, the two sides do not need to be closed, select one of the side of the opening position of the drawing of the two close to the oval, when the mouth as a child fish, note that the mouth is a rounded and flat shape, as shown in the figure below.

Step 2, and then near the mouth of the fish on one side of the quarter of the whole body, longitudinal drawing a circular arc, arc and mouth with a circle between the fish eyes, so that the completion of the fish head part of the painting, pay attention to the eyes of the fish do not leave the whites of the eyes, as shown in the figure below.

Step 3, then on the other side of the open end of the direct drawing of the fish tail, the shape of the tail should be enlarged appropriately, and at the same time with the curve of the fish tail, so as to give a sense of suspension of the fish in the water, as shown in the figure below.

Step 4: Draw the dorsal and pectoral fins of the fish with curves to make the fish look more like it is swimming in the water, and use curved lines to portray the dynamics of the fish, as shown in the image below.

Step 5: Finally, complete each part of the connection, check the proportion of each part of the size of the fish tail up and down whether the symmetry, as shown in the figure below, the fish sketch is finished.

The above is about the fish sketch drawing, I hope it can help you.