This is a problem I've been seeing for some time.
I tag and describe my images quite well and as a photographer have around 40 images per blog post however in search it's not uncommon for just an image result to show rather (in the search results) that the full blog post as intended.
So to clarify this isn't in image search, lots of my work is already there, but as a clickable link in Google web search that leads to what appears to be a page and the image with two smaller images above it.
Is this a quirk of Wordpress or is it a behaviour that can be counteracted by code?
