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I don't have a html titel or any content except photos on these high pageranked pages.
Google indexes text. If the text that is visible on the page doesn't contain the keywords you want to people to find you with, people aren't going to be able to find you with those keywords. If you don't have any visible text on the page at all, people aren't going to be able to find you using *any* keywords. The meta keywords tag doesn't count, because Google doesn't use it.
PageRank isn't going to do you any good unless the keywords being searched for are on the page to begin with.
Exception: If you can arrange for the keywords to appear in the "anchor text" of links from other sites to yours, that might get you off the ground.
Can't you at least put a title on those pages?