Step 6: Draw the guides for Isabella's legs and feet under the body. The guides consist of two vertical lines under the triangle that have a small oval at each end for the feet.

Step 7: That’s it for the initial sketch! You have the basic shape of Isabella from Disney Channel's Phineas and Ferb. Now go in and tighten your drawing. When learning how to draw Isabella from this point on, press harder with your pencil in order to get darker lines and a more defined sketch.

Step 8: Now learn how to draw Isabella's eyes. Darken the circles in her head. Draw a small circle inside each eye as a guide for her pupils. Inside each, pupil draw an even smaller circle to represent glare. On the top edge of each eye, draw two small lines for her eyelashes.

Step 9: Now learn how to draw Isabella's nose and mouth. Above horizontal construction line, draw a tiny angled line similar to a caret (^) for Isabella's nose. Underneath the horizontal construction line, draw a long curved line for the top of Isabella's mouth.

Step 10: Draw another curved line under the first for the bottom part of Isabella's mouth. Inside the shape, draw another line on top for the teeth and a curved one at the bottom for her tongue.