Instead of taking all the time to outline and create a clipping path, or using the eraser you can very effectively use the "curves" to remove most of the background. If you still have a few areas, or ones that were darker than your value 9, you can use the eraser or selection/delete for those areas. A word of caution: you must watch your drawing closely to make sure you do not posterize the image by removing too much of the in-between values. When I did this one, I kept the resolution at 300 and reduced it to 72 when I was done with the adjustment.
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