I have always felt staircases were a big part of the iconography of Sleeping Beauty, since the spiral staircase she ascends to get to the spinning wheel is part of the ooriginal tale. Plus, Maleficent is an important part of that cover, but doesnt overpower it.
And DisneyDuster... yes, you can see the lines. But not at the right thickness in relation to the spaces they describe. They are so thin they tend to disappear unless one looks at it up close. And look at the curl over Aurora;s shoulder: in the lighter part, the linework fades into the background color (almost).
If you look at the film, the line thickness is always good, so that it doesnt look like just blotches of color (please refer to all the hooplah over the bad restoration of Cinderella if you want to truly understand this
)
I know they always market Cinderella with blues, but that pink/purple is the color I most associate with the film from my memories. That's just me though, I know; I get your point that most people associate the film with blues because that's the way they've always seen the character/film marketed.
I think in European countries, the title won't be sideways. All previous Diamond titles didn't have it, and it looked great! I'm quite satisfied with the cover, but I'm interested to know if they'll give it a new restoration. I made a restoration comparison of all the other releases the film had over the years. In each case, they managed to make it look better than before, so it's a big possibility it'll happen again. 
