update README.md

Author: lukasmwerner

README.md

@@ -6,7 +6,11 @@ image. Additionally, it also saves the visual differences to a file called
 
 Here is a sample image of the visual difference:
 
-![](./diff.png)
+The difference will be in red.
+
+|                       |                                                                            |                             |
+| --------------------- | -------------------------------------------------------------------------- | --------------------------- |
+| ![](./data_chart.png) | ![A picture showing the difference between a hand drawn chart](./diff.png) | ![](./data_chart_other.png) |
 
 ### Usage