Pixilated sky fix and comment field unique per image?

Hi Gimp-user,

1)
The blue sky is kind of pixilated in this image.
http://www.fws.gov/digitalmedia/cdm4/item_viewer.php?CISOROOT=/natdiglib&CISOPTR=6008&CISOBOX=1&REC=14
How would you fix it?

2)
Is the Comment text, located at Image > Image Properties, unique per image?

I downloaded the above image and copied/pasted the download URL in the
Image > Image Properties > Comment text area for documentation purposes.
But then when I created a new image (File > New > Advanced Options),
the comment field contained the URL and not the default text from the
Preferences.

Thank you.

--
__________________________    
DJ                      


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