Hmmmmm -- I don't get it....

All my other photos that I uploaded on this blog -- let you click them to see a larger version. And I KNOW I have a larger version of that neat Celtic Horse picture uploaded,... but for some reason== clicking on that image is not working to take us to the larger version. I tried copying the HTML from the blogs where the pictures DO work (putting the correct image addresses in) but it didn't work so .... I just don't get it. Hmmmmmm. Oh well.