The pins from the template to pinterest are too small

Hi,
To all my posts I add full size images. The problem is that when I pin the photos to my pinterest account (using my pinterest pin plug or simply the chrom plug on my chrom toolbar) the photos on pinterest look small. when you click on them you can see the full size but when it shows on the wall of pinterest they are too small.
see exp this post http://indietravel.net/biking-buenos-aires/ – as you can see they are full size images. on pinterest they look small – see here:
http://www.pinterest.com/IndieTravelNet/argentina-with-indietravel/

usually pins there are much bigger. see exp: http://www.pinterest.com/all/architecture/

tnx!

Hi ,
No it’s too small, look at other images on pinterest , you’ll see they are bigger

tnx

hi,
small images on pinterest:
http://screencast.com/t/r2oVGmrBm

http://screencast.com/t/ViFyuDEMeJf

Thanks for you message.
Radu A.