My website consists of many albums, like: https://public-transport.net/tram/Innsbruck/
It has a sitemap which was reported to Google Search Console, but the result is:
they found the pages, they are crawled, but at the end they are not indexed.

Has somebody an idea why they are not indexed?
And how to motivate Google to index all the pages and pictures?

Hello,
coming back to that, isn't there another solution?
Because what Google displays are only the album's folder symbols.
The Tiger album is very attractive, is there really no solution?

No one knows. I don't mean just within the jAlbum community - I mean that no one, anywhere outside of the Google inner sanctum - knows how to achieve this result. And as soon as someone figures it out, and starts "gaming" the system to make his site show up on the first page of search results, Google changes what it's doing, in order to thwart him.

There are crooks out there who will charge you exorbitant fees to improve your Google visibility. Mostly what they do is post spammy links to your site on sites like this one. They're wasting their time here, of course - we clobber them very quickly.

Google's image indexing is particularly terrible. Search for an image of someone you know. You'll get either no results, or links to pages with pictures of completely unrelated individuals. A page about the person you're looking for might not have an image of him, but the Google indexing picks up a photo of someone or something else that happens to be in a footer on the page.