wow! That's a pretty big gap between the two! Needless to say, lots of improvement. Is the second one more like what you wanted the first one to look like when you drew it?
i think if you would've added some cloud shapes (the same color as that grey) on the outlines of the window than it'll add some good negative space and it won't look like the sky is just cut off right there. or you could've added the same cloud shapes to the outside of the arch and made the inside of the clouds have the same starry background... my .02