Step 11: Now learn how to draw this Phineas and Ferb character's hair. Phineas' hair is a series of spikes on the right side of the head that look like the top of a palm tree. Draw three long spikes on top and three smaller ones on the bottom.

Step 12: Now learn how to draw this Phineas and Ferb character's arms. Tighten the shape of Phineas' right arm by drawing a bump on top of the shirt (to create the collar), thickening his arm and drawing his fingers using the guides drawn earlier.

Step 13: Again using the guides set earlier, draw in the left arm as you did with the one on the right. Draw a short vertical line in his palm to finish off his hand.

Step 14: Draw in Phineas' T-shirt and make it slightly wider at the bottom. Draw a stripe on each of his sleeves and three stripes on his torso.

Step 15: Darken in his shorts by splitting it in half for his legs and drawing a pocket on the right side of it.