Start by drawing the cactus flower pot. Draw the top of the pot with a thin rectangle with round edges. From there draw a U shape. This will be the bottom of the picture so make sure you're drawing the pot towards the bottom of the sheet of paper.

Next, draw a circle coming out of the top of the pot. This will be the small cactus stem. Then draw a larger oval shape out of the other side of the top of the pot and this will be the main stem or main trunk of the cactus drawing.

Next, draw curving lines down the length of each of the cactus arms. These are the rib lines of the cactus.

Next is to draw a cactus flower at the top of the cactus. Draw a simple curving line creating the flower with a small circle in the middle.

Next, draw short lines around the outside of the two cactus arms. These are the sharp spikes of your cactus.

The final step is to outline the cactus with a black pen on the final lines and erase any extra lines you had while sketching the cactus.

The last step is to treat your new realistic cactus drawing as a coloring page and color in your cactus with your favorite crayons, colored pencils, markers, or even watercolor paint.