Quoting Matt D.
ant to improve on your piece, spend more time on it and make the colors more synchronized. Maybe add armor or different weapons, and all you need for that is at least one extra set. But learn to take pride in your work. Don't be satisfied with your mocs until YOU feel they're complete. If you look at my Toa, Tohuka, I have multiple different variations of him because he's my main character so I'm always trying to improve on the armor, weapons, etc. I hope that helps because I wouldn't give you advice if I didn't follow it myself.
I do have different versions of my guys but I also play runescape so it takes awile to upload. Also my main guy Hijuaro has 7 (or 8 if you count the flight mode). But thanks for the help. Also my Hijuaro is fashioned after your Toa Tohaku