I have a Wix Pro Gallery on my Website. The Website is already indexed. If I check my Site Content on Google with site:sukosurf.com the Images not showing up.
Any Idea what the problem is?
WIX Pro Gallery
I researched a lot but didnt find a solution for exactly this problem
SEO is a detailed topic - and essentially allows you to guide search engines (like Google) to index various things, such as pages, images and more. That said, a lot of these actions are guides towards search engines, and they may or may not follow.
Despite pages being indexed, it’s not a guarantee that other content, like images will also be indexed. It can take time (it might be that your images are indexed now. I know it’s been a little while since this topic was started).
Google often needs more signals to indicate that content is worth indexing, compared to other search engines, like Bing. This generally happens outside of the site, such as sharing on social media for instance and linking back to the page with the Pro Gallery.
Additionally, you could add image schema to list all of the image on the page 
Sorry, this doesn’t seem to be a solution at all. All images on my page are showing in Google, just the wix pro gallery doesn’t show. Even with title tags and alt text are available.
Please verify: