Dear Sandra, I would join the advice to have the far away mountains with fainter tones and I would add to the close range some very light yellow and ochre to the enligtened parts (provided there's some sun) and or some light pink contrasting with a cooler and dark enough purple in the shadows. I would reserve the pure withe only to the clearest and closer highlights.
Moreover, the ground has to reflect some of the sky colors too (where it looks directly upward and don't get much direct light, also as a thumb-rule to unify the painting masters often suggests in tutorials.
Anyway the composition and feeling are quite there ....
Panta rei (everything flows)!