When you mention secondary lines, I assume you're referring to the fainter line created when drawing? This tends to be an issue with ghosting too close to the page. However, if this happens to be due to executing incorrectly, just move on from it and make no attempt to correct it.
Regardless, I think that the exercise is done fine. You've gotten the idea down, and that's the important thing. One thing I'll say is that you should try to make the planning points a little smaller. Especially when you have to replot your points, having larger planned points would make the ghosting process quite a bit more confusing.
But good luck with rotated boxes!
Thanks for the luck and the critique!! :D
When it comes to technical drawing, there's no one better than Scott Robertson. I regularly use this book as a reference when eyeballing my perspective just won't cut it anymore. Need to figure out exactly how to rotate an object in 3D space? How to project a shape in perspective? Look no further.
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