I think, I found out the reason that the Google Image search only displays 2011-2012 pics. A google photos album (then Picasa Album) created a second album (with the same name) on Jan 13, 2012, after the 1st album has 900 photos. Probably a limit then. Picasa was then closed. The 2nd album, currently 1695 pics doesn't have a limit. On my other blog, I didn't have 900 pics then and there's still just one album.
I think, it's not (easy) possible for changing that, even if I would move all pics and change all links (what would too much work either). Pics must be uploaded within a post and are probably indexed then for the web search. I mentioned other Google indexing bugs before. And there are still issues with wrong HTML code in the new UI.
When writing this, I also found pics from Feb 2012. But even when I search pics for the last year or last month there are only 2011-2012 pics shown.
But obviously the new updated pics, I recently uploaded (rating 10-7) already show up. Wordpress pics still show up after almost a year.
By a regular Google text search, searching for last year, 2 posts show up: Update 2 Anibal (2000) and Update 5: Emu's All Live Pink Windmill Show. Both from this month. 27/21 hits, 1 boy, other girl. So there's still hope.
Still a mystery the many hits of Info 20.
Hits last month
Info 20: 580 hits
Update The Thanksgiving Visitor: 441
The Secret World of Alex Mack: 93
Summer of the Monkeys: 39.
Last 24 hours 3x4 hits on Info 20 post. At 2pm, 8pm and 0am. Same peaks and times at Thanksgiving Visitor but 3 instead of 4 hits. So maybe a robot or similar.