i noticed in your drawing that there are some lines that don't follow two point perspective on your drawing you did a good job on making all the vertical lines straight, so that properly follows two point! i think the issue is that not all the horizontal lines are two point. something i try to ask myself for two point is if the line is not vertical, how would it follow the vanishing point dots? i did try to draw the second boxes under your perspective line, but it ended up looking a bit strange since the lower it goes, the more dramatic it would be. so unfortunately i didn't feel like i could 'fix' your stack via blue lining, but i drew some more boxes to try and show how i do it (drawing a line straight to the respective vanishing point, then adding vertical lines) good luck with learning perspective, its super fun once you get the rules ingrained in your head! | Artwod Feedback