2J Image Viewer extension have admin interface which make you able to manage all images, galleries, css and all carousel instances settings. Interface of the admin section implemented in Joomla! native style, and you will not have any problems with it.
2J Image Viewer have advanced installer with custom interface:

2JImageViewer main component sections views:

Component slideshows manager:

Component images manager:

Component CSS Editor general view:

Component CSS Editor file edit view:

Component Scanning Directory function:

Component Batch upload function:

2JImageViewer component settings views:

2JImageViewer images manager:

Component Images manager:

Component New/Edit image screen:

2JImageViewer module & plugin:

2JImageViewer Module settings:

2JImageViewer Plugin settings:

Component SlideShow Settings:

2JImageViewer Main options:

2JImageViewer Image panel:

2JImageViewer Counter panel:

2JImageViewer Caption panel:

2JImageViewer Navigation panel:

2JCarousel Text Add-ons:

2JCarousel Thumbnail settings:

2JCarousel Image settings:

2JCarousel Advanced settings: