Step one:
The second step:
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Then draw three rectangles on each side.
Step three:
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Next, use arcs to draw the shape of the upper hem of the curtains.
Step 4:
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Then draw two bows.
Step 5:
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Use arcs to draw the shapes of the hems and connect them.
Step 6:
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Also use long lines to draw the folds of the curtains and connect a line in the middle.
Step 7:
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Finally, apply a nice color and the curtains are ready.