STEP 1.In this first step you will draw the shape of Phineas's head which happens to be a triangle that is on an angle. Draw the facial guidelines as you see them here. Next from the head shape you will then add all the limb guidelines including the shapes for the hands and feet.
STEP 2.In this next step you will gradually start shaping out the head and give him his smile line along with the dash for his eye on the left. Draw an ear and then start drawing the shape of the shirt as well as the shorts, legs, and arms.
STEP 3.Now in this next step you will draw the opening for his mouth and then the guidelines and for the hair on top of his head. Detail the inner ear and then draw the rest of the shape of the arms and hands including the fingers. You will then make the bottom of the shirt and shape out the legs and add the socks.
STEP 4.As you can see in this step Phineas is starting to look more like himself. You will then draw the rest of his hair as well as draw two big circles for his eyes and add the eye lids. Make a thumb on the left hand and then strip out the shirt. Add the pockets and then the detailing on the shoes.
This is the last drawing step and you will give Phineas eyeballs and the rest of the strips on his shirt. Detail his shoes a bot more and then you can erase the guidelines and shapes that you drew in step one.
This is what your drawing should look like when you are done. All you have to do now is color him in and that is it. You are done with this tutorial on how to draw Phineas from Phineas and Ferb step by step. I will be back soon in a bit so stick around folks.