Link the following items below to actual work portfolios.  If you're more comfortable (have to be able to do at least htat on here) then you could do a feature on instagram or something and link straight to it

In the template you linked to jobs in a portfolio, I'd try to really build them out in a major way ie a description, video if possible, sources and links for more info, an article about the process, a call to action to contact now or learn more.  So each job has it's own page (top right click on pages, then go to the bottom of that and click the plus, give it a good name and link to it from inside the page using the link symbol. It pulls up the pages on your site which is nice, or you can link straight to the gram). If you want a slide show though it's below

Oh and since that would literally be a slide show portfolio on a not super important search engine page it works in that case

A background image doesn't appear to be a common feature on here and honestly they're a bit nineties so not sure I'd do taht haha