The car is a little blurry, and can be sharpened up to an extent. Without using a larger original, it will look worse blown up or printed. What do you want to do with the image? There's ways to affect the quality of the black and white portion, but here's what I can do with the original you've posted for now. It doesn't look natural if you blur the foreground, unless that's what you want. More contrast there usually looks better.
