This looks great! the only thing i'd point out is the clouds in the background. the clouds to the top left could be a bit darker, then make the hrns a little brighter and for the clouds on the right make them a bit brighter for more contrast against the wings
imo tinting the sky a little red might give it that more dramatic effect. i also added basically a thick soft brush line at the bottom with extra dark blue to give it that darker contrast but made it super soft.
tho looking at it again i made the sky a bit too red, just a slight tint would do but i'd recommend making it slightly darker to contrast the horns but not too dark so that it still contrasts the wings too
This is just my opinion so feel free to ignore if its not what you are going for