Do you have several versions of that image? the one you uploaded is 216 px wide x 144 px high. That looks like a thumbnail image.
I suggest uploading one that is roundabout 800 px wide...
When ever I have several different sizes of an image, I name them with the size similar to: car-1902x1200pxh.jpg, car-800pxw.jpg That way it is quick & easy to identify the one to upload
Well, it's real traditional which is what people generally are looking for in a thing like this but . . . I'm not at all crazy about the lime-koolaide green. I that a requirement?