Yeah,  pixetrichor ,the idea is suggesting something is happening in those surfaces. About the shade of blue issue, i have to admit i carelessly picked "anything" that looked blueish for the sky. Probably i need to make some test with blue shades.

Thanks!

Made totally on purpose. I wanted to avoid the "perfect" dithering, and looking more to get noisy/random dithering (introduce some sort od disarray, even at the cost of loosing the "perfect" and clean appearance). 

Thank you for the input!

That dithering on clouds feels really noisy.

It might be just me, but I feel like the shade of blue might stand out a little, or that it doesn't blend well with the rest of the piece (mainly the greens). Try to lower its saturation and maybe the same for the brightness, then go from there. But take my suggestion with a grain of salt.

As for the textures, I believe they're well done with how they ensure the piece doesn't feel flat or two-dimensional; Great job on that!