These look really cool!
That being said, I'm not sure how well they capture the old Bionicle aesthetic. G1 Bionicle was always hyper-detailed and textured, and I feel there's still too many smooth pieces here to really mimic that.
I also think you could maybe swap the armor styles on these two. Tahu's armor seems more slim and seems like it would fit Gali better, and Gali looks bulkier and that might fit Tahu better.
I really love Tahu's sword, by the way, that looks awesome!
Overall, they look really awesome, just maybe not as close to the G1 aesthetic as intended.