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Joan,
Your file being too big won't cause fuzziness. But, as an example, see the pixelation on her neck just inside her hair on the right (as the viewer). That's caused by overcompression, an option chosen when the file is saved as a .jpg.
By the way, you never want to take a smaller file and try to make it larger, you will lose quality and the degree of lose depends on percent of file size increase.
Also, if you are taking a larger file that is of poor quality and decreasing that, you will still have a poorer than possible image quality in the smaller file, though the appearance of pixelation might be minimized by decreasing the size.
I would say to give the most visibility for critiquers, continue to use and image that is 400 pixels wide.
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