yeah i know,something is wrong with the sun...i might change it...
[srry for my english,im from israel]
AA - meaning Antialiasing or smoothing the edges
You already put an enormous amount of work into it. Nice colors and a lot of dithering. Please take these words to encourage your work: If this is your first background, i´ve got some valuable advice. (This advice helped me a lot in the past!) To make the sky more interesting, take a look at a photo reference of a sky on a really stormy day. Add some (cleverly made) clouds - it makes the picture more lively.
umm...no upset but I have no idea what you're talking about :\
It's not bad xD Some AA could help the mountain!
The sun looks a little too sphere-like. I always just see the sun as solid white. Some yellow one the edges might work, though. The clouds don't look much like clouds at first (until I saw the distant cloud that was the same color). I think that it's the shape. Maybe some slight anti-aliasing on the mountain tip's edge would help, too.
I don't remember...:P