I’m a little concerned what happened to that Breeze helmet, but that’s an aside…
Colors ignored, this is not a bad first start - definitely superior to my first attempts at a Bionicle MOC. The inclusion of system seems to be out of necessity rather than stylistic endeavor, but hopefully it’s indicative of future creations having more intended placement of pieces.
As for your lack of available pieces, chin up - the resale markets for LEGO are fascinating places for certain.
Nice work!