Step 16: Draw in Perry the Platypus's duck-like feet and draw wavy lines at the ends of them to represent his webbed toes.
Step 17: Now learn how to draw this Phineas and Ferb character's tail. Darken the shape of Perry the Platypus's tail and draw a few lines within it that resemble crosses as extra detail.
Step 18: That's it! You now have a nice sketch of the Phineas and Ferb character Perry the Platypus. You can stop at this quick drawing for a rough, sketchy look or go for a more finished look by continuing to the step below.
Step 19: For a more finished, inked look, carefully draw over the final sketch lines with a pen or marker. Wait for the ink to dry, and then get rid of every pencil mark with an eraser. You now have a finished inked drawing of Perry the Platypus (Agent P)! You can stop here or go to the final step to complete learning how to draw the Phineas and Ferb character Perry the Platypus.
Final Step: For a completely finished Perry the Platypus drawing, you have to color it. You can use markers, color pencils or even crayons! Color Perry the Platypus's hat and eyes brown. The headband on his hat is black. His beak and feet are yellow-orange. Perry the Platypus's tail is light brown, and his body is a greenish/aqua color. Experiment with your colors to get it right! That's it! You have now learned how to draw the Phineas and Ferb character Perry the Platypus (Agent P).