It’s looks perfectly fine on my end. Is it possible to send a screenshot of what it looks like on your end?
Also keep in mind that Responsive Background Images have to adjust themselves to scale for the Visitor depending on the size of their browser. If you resize your browser (shrink and/or open it wide) you’ll see how your Image will adjust to fit the screen the best it can without becoming too stretched or distorted.
When I look at your homepage (assuming that’s the page you’re referring to) the image isn’t distorted or blurry at all. The Theme itself isn’t distorting or blurring your image, it’s showing it exactly how the image is. Here is the direct link to your image – http://www.mrandmrsdodd.com/wp-content/uploads/2016/12/rsz_img_0979-1.jpg If you compare the image link itself with the image on the site they both look exactly the same.