The key with this image is NEGATIVE SPACE. Forget trying to draw the white water or draw the green leaves. Draw the dark shadows behind them. Focus on that, and let the light shapes emerge in the white paper in between. Try lightly sketching in some guidelines, but then using only AREAS of value, avoiding line completely. And see how dark those black shadows are? Don't wimp out and make them a wishy-washy gray! Sometimes it helps to squint your eyes, so you can see the overall blocks of light and shade. There's also the perfect place to practice your 'broken line' masonry technique on the section of wall.