say anything, but you asked for it.
As soon as the preview came up I had to vote this pic down, it was that bad.

It starts off fine (with the clouds) but then you hit the mountains and have a wtf moment. The image looks like a patchwork of poorly put together clip art. The trees especially look very tacky.

There needs to be more seemlessness between the individual aspects of this image and a better select of stock images. Also, if you're going to have trees there give them some more perspective. The ones closer to the mountain should be much smaller.

Just my $.02.

I certainly appreciate your comment. The useful information about giving the trees more perspective is great.
I must point out though that there is no "stock images" in this picture. All f this was made using Gimp, no clipart what-so -soever. Trees, grass, and mountain, everything, were all hand made on The Gimp, using it's scripts and plug-ins. This was all hand made, not being generated using Bryce, Adobe products, or any of the like.

I can agree that some of the stuff needs to be cleaned up with better looking detail. You must admit though, there is nowhere else even remotely close to a nature scene like this being made with hundred percent Gimp found anywhere.

I am unsure why people think that Gimp things need to be done using clip art. Maybe it comes from the lack of Gimp skills or knowledge? However ,if it must be claimed as clip art, it was "clipart" made via Gimp :)
Thank you for your comment, and I will definitely work on the trees. I didn't see anywhere a tip to improve the mountains or any other aspect of the image.

Aha. Well the image seems far more impressive seeing that everything was created in the gimp. I assume you were attempting to do something akin to painting with the gimp.
Krita, the KDE image manipulation program was actually made with this sort of thing in made (and comes with suitable filters, oil paintings, etc.)
Maybe krita would be better suited for the type of thing you're attempting, but good work nonetheless :-)