Hey there! The main issue is the boxes converging. If you have the opportunity to draw over the reference, you'll notice that the convergence isn't as strong, but rather more "open." In other words, the vanishing points are farther apart, which is why the boxes don't look as narrow as they would if the vanishing points were closer together. On the other hand, the vertical lines of the lower box are completely tilted, when they should remain straight. I corrected these boxes. Hope this helps!