It's ok, I deleted your 2 other duplicate posts in the Mac and XP forums. This is the Design forum, so you're in the right place. :smile:
The only blemishes I can see are around the horizon line on the left and middle. You could use a combination of the clone and sharpen tools for the sea, and increase the brightness of the selected areas of the sky with a high feather setting so your edits blend smoothly into the surrounding areas.
The photo you've posted here looks quite easy to fix due to it being similar shades and gradients of blue, but other photos might be more of a challenge.
Feathering blends the edge of the selected area with the surrounding area. I use Photoshop, so I'm not sure if Gimp has this feature or how to set it.
In the image below, I've selected 2 circular areas and brightened them. The one on the left is a regular selection with no feathering, so you get a hard edge. The one on the right is feathered by 5 pixels, so the brightening effect is gently blurred into the surrounding area. A setting of 10 pixels would blend it even more.
Obviously, this example is exxagerated so you can see what's going on, but with more subtle use you can correct the blemishes and blend the corrections into the surrounding area.
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