Step 21: That’s it! You now have a nice sketch of Isabella from Disney Channel's Phineas and Ferb. You can stop at this quick drawing for a rough, sketchy look, or continue to the step below to go for a more finished look.

Step 22: 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 erase your pencil marks. You now have a finished inked drawing of Isabella from Phineas and Ferb! You can stop here or go to the final step to complete your Isabella drawing in its entirety.

Final Step: For a completely finished Isabella drawing, you have to color it. You can use anything you want: markers, color pencils or even crayons! Color Isabella's hair black. The detail lines of her hair are dark blue, as well as her eyes. Isabella's bow, dress, shoes and tongue are pink. Her belt is a dark pink, almost red, along with the inside of her mouth. Her skin is peach, but if you don't have peach, improvise and use pink or light brown. That’s it! You now have a completed drawing of Isabella from Disney's Phineas and Ferb.