Quoting ROBOCOP603- MASTER OF BLACK HOLES .
That's pretty nice!
I really like the torso and jetpack.
The weapon looks decent despite being simplistic.
Even though the arms and legs are also simple as well, they suite the character. The feet however could really be better if they were custom. But that's also just me being picky and trying to push your abilities.
Now onto the head.. I'm not really sure what to think of it, because it seems a bit 'out of place'. I can't really see how a good Toa of air would have horns and red eyes, and the head seems a bit too long, and thin. If it is supposed to be evil then that would be more understandable.
I'm just trying out some custom head ideas and I didn't have any other color studs to use as eyes. As for the legs and arms, i got lazy.