I seem to recall this website and perhaps you have changed it, but at one time I believe the images were huge, which may have been a problem for Google.
I would echo the comments about the alt tags, which appear to be rather strange. Having alt tags like “Swedish style base corner.jpg” is about as useful as a chocolate teapot for Seo purposes. It tells me nothing.
One general observation I would make is that Google seems to be really slow lately at updating their indexes to reflect changes, let alone have sites go up the rankings and this has been causing me some frustration but it’s not Blocs.
This is just something Google are doing. I suspect they are also limiting how much they are willing to index from single sites to avoid having hundreds of images from a single source. Right now I am working on a new website that is over one hundred pages with a certain trepidation for how long it will all take to rank.