Step one:
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First draw two arc lines, and use small polylines to draw hair below.
Step 2:
Draw another semicircle below, and draw small semicircles on both sides to serve as ears.
Step 3:
Draw two circular glasses inside and connect them, add eyes and then draw a smile.
Step 4:
Then draw a horizontal square and a vertical square as a scarf.
Step 5:
Then draw two vertical lines in the middle, and draw the same vertical lines on both sides to connect them as robes.
Step 6:
Draw a horizontal line in the middle of the robe, and use a square below to represent the pants.
Step 7:
Shoes can be represented by trapezoids.
Step 8:
Left and right sides, draw two diagonal lines and connect them with arcs to make the sleeves.
Step 9:
Draw a semicircle on the cuff as a hand. You can add a magic wand on the hand and add stripes to the scarf.
Step 10:
Finally, apply some nice colors, and Harry Potter is ready.