You're right...you've done well. Looks really nice!

The color of this sky is so intense! I saw the similar image in your b&w blog, and... well with this sky color seem to me the obvious choice. However, why don't you try to convert, just for fun, the color image into b&w using the channel mixer, with a lot of red in, and blue out, to see how dark the sky would come out?

Massimo, I tried that actually, and it comes out practically black!

That's an intense sky! I actually thought it was a night shot at first, as the sky often comes out with that kind of hue/saturation on long exposures.

Very nice.

This is simply stunning as is!
Wonderful colors, lighting, a different perspective, details, .... I like it!!