Step 6: Draw a couple more lines on the right side of the octopus's body for more tentacles. To make it more challenging, curve the guides into a spiral. For an easier drawing, make the lines straight. You can also make the guide lines shorter if you don't have enough room on the paper.
Step 7 (optional): If you'd like, you can draw another guide line that overlaps the others. You can also skip this step and pretend that the other two of the eight tentacles are behind the octopus's body :)
That's it for the initial sketch! From this point on, press harder with your pencil to get a more defined sketch.
Step 8: Outside of the first circle, on the left side, draw a small circle for the octopus's eye. Sketch lightly at first. When you get the size and placement right, darken the line. Inside the circle, draw a small rectangular shape and shade it in for the pupil.
Step 9: Draw a circular line around the eye for the fleshy structure that surrounds it. Make the line a bit wavy as you draw it around the eye to make it more organic. Along the edge of the initial arc, draw another wavy line for the octopus's eye on the other side.