That looks really cool! Here are some things you can add, however.
- Protective chest plate (metal)
- Shoulder cybernetics w/ logo
- Upper leg cybernetics w/ logo
- Logo on flap
- Accessories (optional)
Personally, I haven't drawn my protogen yet, but I'm practicing that. The list is stuff I usually see on a protogen. ¯\_(ツ)_/¯