The images are too small. The style options on the right don’t give an option to modify the image size. Is there a way to do this with the Data Table component or do I need to use the Matrix Component?
It looks like the issue is that your datatable column is named image instead of avatar.
To target a specific column in a datatable using CSS, you can reference it with .col-columnName. Try updating the .col-avatar selector in your css class with .col-image and see if that resolves the issue.