The car is a bit too blur IMO..the number 11 is fine but the text...I think it would be better if you lower the opacity so it doesn't stand out too much..because it is white on a black background..for the car..I don't know what Paint.Net has but in Photoshop I would duplicate the original, non-blurred, put it below the current one and change the blending option of the blurred one...
That is in Photoshop, I don't know does Paint.Net have it or not...but you get the idea...right?