Is there a way to preview an image file that has been uploaded

This could be either on the form as it is being filled out, or on the "review order" page

If it's before the form is submitted, you can use our Image Upload Preview widget: http://widgets.jotform.com/widget/image_upload_preview. Here's how you can add a widget to your form:

http://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form

Image preview is available in the form submissions page: http://www.jotform.com/help/269-How-to-view-Submissions. You can also create a Grid Report and enable modal window:

http://www.jotform.com/help/105-How-to-create-a-Grid-Listing-report

Thanks