design looks good but dont do any more with it or it could become cluttered.
on the data.
some graphs need better titles to you can understand what its showing.
some of your graphs need to be averages instead of Sum as for example sum of horsepower by car body has no meaning at all unless you only have exactly one entry for each body in your data.
also you need to clean up the data as you can see you once have porcshce and once Porsche.