A few things I found. The bottom 3 steps are converging a little high. The vertical lines are getting closer together as they approach the edge of the cylinder. This is good. The steps at the top look very parallel. They should have a slight convergence due so they can maintain the curved look around the cylinder. The cylinder is tilting towards the viewer. I think the height of each step should be increasing. Based on the height of the first steps it is likely that the curve of the steps may disappear around the center cylinder before they get to the roof. Hope this helps. | Artwod Feedback