Question: Complexplot help

So im working on this question right now:

 Using “complexplot”, show all of the cube-roots of -8i (you will first have to 
find the principle cube root, convert to polar form, and then add appropriate
propportions of 2*Pi to the argument to find all other roots, using Maple for all
Im going to attach my attempt to this post, all feedback is greatly appreciated and if im doing something wrong, if someone could lead me in the right direction.
Thanks everyone!
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