Hi Omri

I'm a bit pressed for time right now, but just dropped by with an idea on how to make the mountains work a little better with the ground colour.

If you look at the thumbnail the transition between blue and brown is really quite sudden, even though you have already blended it a little. I would consider mixing the two in a slightly different way - by having streaks of the brown fading away up into the lower slopes of the mountains, and some of the mountain blue streaking into and fading out in the flats. Not such a horizontal blur line, but a jagged interlocking pattern - not too regular. Feel the mingling of the colours....

Probably not describing it very well, but I'll drop by later and see if I can understand my own suggestion