Take some silver out of the top half of the face and make it a bit more green. Maybe make the feet more wing like. Actually, make the feet a bit more bug like, like an insect or an arachnid. Other than, you've nailed it.
ahahah....it dosen't actually say that anywhere, but okay (wipes sweat off neck)..and the right arm has funny porportions..the "rocket fist" i sugggested fails cause its forearm thrusters unbalaced...can it fly? the shoulders might be an obstruction and the swords too much weight..hows it gonna hold its "heavy" swords during flight...?
Not only that, but the head looks like it could fly off(with the wings and pointy golden bit)...not unlike Mazinger Z. that jet pack seems to be influenced by a gundam...Awesome job, combined with the good old "impossible cylinder" limbs. at first ppl just did the limbs at angles that did not show the joint, but then later made up the segments(yours has special, kinda halo-spartan segments)+wing zero shoulders