This is a blend from one RAW file. Sky at the same exposure of the land is just more than the DR of the camera will allow.....actually not beyond the DR...but as you know...under and over exposure ...you loose the POP of the colors.....so the sky needed a diffrent exposure than the ground to get both properly showing their colors.

The pop and color contrast is also due to a combonation of two things....a polarizing filter, and mild L.A.B. editing.
L.A.B. editing is quite a sledge hammer so I usually edit the curves with only 5-7% opacity on the layer....dont like cartoonish color...just quality color seperation...which this does quite well at that level.

I metered the sky....then the foreground with a spot meter....found it was within the DR I could expect with dual processing of a RAW file. Devided the diffrence and shot in the middle ground.....and shot just a tad (2/3 stops) brighter....as brighter (but not blown highlights) are easier to work with than shadow info...(shadow info is full of noise)

The rest is what you see before you.

Roman