Jack, I know you asked not to, but this is how I best express my techniques! Here's a tut for you on the basics of making shapes, it really shouldn't be hard if you keep trying at it! This is something that I've done a lot so it's all habit, point being, if I've left a whole bunch of stuff out that you're still in the dark about, or need to know anything else, just ask!
Another great person to ask about shapes is Risto, his entire collection revolves around precise and accurate shapes. Not being him I wouldn't know if it's a technique or a set of mind, but either way that's one thing I've noticed about his works since the first I saw of him. Any xara cartoonist would work too.
Again, anything you'd like to know, just ask, I'll do my best to explain. I don't believe shapes are my forte, I'm more knowledgeable in shading, lighting, etc., but I believe the more you copy (Pictures, objects, etc.) the better you'll understand both shapes and shading
Hope this help
Steve Newport
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