If you created a pie graph what particular "elements" of a Pie Graph do you want the reader to notice? What is the overall impression that you expect the reader to have from looking a Pie Graph?
If you created a bar graph what particular "elements" of Bar Graph do you want the reader to notice? What is the overall impression that you expect the reader to have from looking at the bar graph?
If you created a histogram what particular "elements" of a Histogram do you want the reader to notice? What is the overall impression that you expect the reader to have from looking at the Histogram?