Glenn,

There is an evident difference of compression between these two
pictures.
The one at your website wears a lot of jpeg artefacts but the one at
this newsgroup is cleaner.
So or :
1/ these two pictures have not been threated in the same way
2/ the servers hosting these pictures do not deliver them in the same
way and there is an algorithm to compress your jpeg files at your
website...

Hope this helps.
Cheers,
RVB

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RVB -
http://www.cocardes.com .....aviation
http://www.hervebrun.com .....photo
;-)