For images to be generated/rendered, pls choose WordPress as Thumbnail Generation Method in the General tab of theme options. Aqua thumbnail generation(which is the default) won’t work on HTTPS.
Also, I am unable to visit the site due to error – Fitnessinqatar.com is currently not available in your country, Sorry. Seeing the page, I can tell you where the problem lies with the other issue. It could be revolution slider or you can edit the line number 220 of framework/extensions/stylizer.php file to https –
$fonts_import .= '@import url(http://fonts.googleapis.com/css?family=' . $fonts_to_import . ');';