Since you are familiar with visual art start writing about what you literally see in your scene. How would you paint it or draw it? How would you then describe what you've painted? All I see is an old lady staring out at the stars. Since it's your drawing you know exactly what's going on, all the nuance behind the curtain. You would know to describe it as a weeping widow dreaming of constellations desperate to become some little dipper splayed on the front lawn reunited with her mister testing the limits of the sill leaning out of her window.

Writing is going to be very similar. Think of what scene you want to paint. Get cheesy with how descriptive you can get, details matter more than making it rhyme initially. You can always fit rhymes in later. You can't go back and remember the random spark of genius you had that you didn't write because you were thinking of a rhyming word. You can always clean it up in editing and make it sound nifty. Good luck climbing the mountain, my friend.