- Declutter: remove noise items. Many charts have too many tick marks and unnecessary grid lines and framing lines.
- Add focus: highlight the interesting part. Make the regression line more prominent than the dots if that's most interesting. Or highlight a few outliers if those are most interesting.
- Tailor to the audience: Choose a title/subtitle that delivers the message. Is the audience technical enough to care about stats, or do they just need the slope, or just the general trend?
For more specific items, try this interactive data visualization checklist.