How can I improve my image clarity in a Dashboard?

I have a Dashboard that I have been working on. I used the widget Image as I am trying to insert a graph I made (both from Powerpoint and Word Document). I have saved the image as a jpg, png and ppt and tried to insert them into the dashboard but the images are blurry. I have used the snipping tool and Snagit, and when I save the pictures they are crystal clear and good quality but once I upload them into the Dashboard they are blurry again. Does anyone have any tips on how to resolve this issue?

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