eBay API - How to get large item pictures?

Did you try the most recent method provided in the eBay Forum?

I can help to explain and guide you.

That member suggests to include $apicall .= "&outputSelector=$outputSelector"; in your construct of the findItemsAdvanced request.

At that point I would check the XML File returned to see if it's included via Firebug (click the NET tab, then XHR below). In Chrome, just enable Developer Tools and click the NETWORK tab to see returned XML File. Click file to expand and you will see contents without whitespace.

Because the XML file is not going to be pretty, copy that content then paste it HERE to beautify it for readability.

Sample XML file HERE that has both pictureURLLarge and pictureURLSuperSize shown.

Once you verify that the URL for large image has been included in your XML file, second step is to then use it in your markup like so:

$pic = $item->pictureURLLarge;

or

$pic = $item->pictureURLSuperSize;

Sorry I do not have my own eBay AppID to test and their API Playground link is broken but can assist further is anything is unclear.

To be sure, the first step is to obtain the Large Image request and the second step is to simply use the image.