"The sky looked like a backlit canopy with holes punched in it."
Way to go. Simile no-no's 101: Compare things, like the sky, to things that are made to look like it, as in a backlit canopy with a thousand holes punched in it. Tha'd be like saying, "the Sweet N' Low made the coffee sweeter and taste like there was sugar in it."
In the immortal words of Arnold Poindexter, "That's deep, Ogre."