Scanning experts please help - See scan

Hey guys, I finally figured out how to put my images on the web (Photobucket) and garner a large image. Problem is, I think it looks too large and is not as crisp on the clarity as I would like - see corners for example. Is this something a scanner helps or is there something else I can do, as I do not own a scanner. Thanks for any suggestions.

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Select edit. resize. message board.
I do not think it will help much; maybe a little.