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Here i'm showing that the x's start from the middle of each quarter circle, then all 8 'slices' will be the same size.  Also, please try to lift your pad to where you shoot straight on without the slant.  It's tricky and takes some finesse not to create a shadow.  Thank you.

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On the bottom, you have TWO sets of parallel angles, all good except for losing the bottom!  

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Parallel line correction, and try to straighten your paper (see top right edge)