Step 16: Draw the arm on the right using the initial line as a guide. Use the same drawing technique as the other arm. Follow the basic path and make the shape thicker. Make sure to draw Marceline's fingers at the end using curved lines.
Step 17: Use the initial lines at the bottom as guides to draw the upper part of Marceline's legs the same way. Thicken up the legs as you follow the path and curve the shape.
Step 18: Draw Marceline's boots using the same line as a guide. Draw small heel on the back of the boots and make them pointy. The Vampire Queen's boots also have a small point at the top.
Step 19: Use the big oval shape as a guide to draw the rest of Marceline's hair. Make a bigger bump on the top right side of the hair. The bottom part should be pointy. Draw a few more jagged points throughout to give it a more hair-like feeling.
Step 20: That's it! You now have a nice sketch of Marceline the Vampire Queen. You can stop at this quick drawing for a rough, sketchy look, or continue to the next step for a more finished look.