To replicate either of your screenshots, you would need to to use SimpleViewer-Pro configuration options.
You could upgrade your WP-SimpleViewer plugin from SimpleViewer-Standard (which it comes bundled with) to SimpleViewer-Pro by following the instructions on this page.
To replicate your 'template2.jpg' screenshot (to position the captions below the main image and the thumbnails), use the following configuration options in the Pro Options text area of your gallery's settings window:
If you wanted to replicate your 'template1.jpg' screenshot (to position the captions between the main image and the thumbnails), you would need to use a Fixed Layout.
SimpleViewer Support Team