A relitively simple MoC, but I like it. The color scheme flows pretty well imo, the weapons look good, and I like the mace storage. It'd be cool if you could incorperate storage for the sheild as well, though I can see that being hard with the gear function. As a stickler for story I will say they are right in how she was discribed, but as this is more based on Gen 2 (I think) some artistic licience is acceptable lol.
Also, ignore this if you know of it, but if you want story details there's a great site called Biosector01 that has a page for Helryx and at the bottom of the page under appearances it lists what she's been in. Most of here appearances have not been in books, they've been in the online serials, which were copied on to BS01 before Bionicle story dot com was taken down. So if you want to read them they're there.