Me and a friend are making a game and I am responsible for the art.
I have done some pixel in the past and I feel I am decent.
When I was creating a new armor set I looked up Starbound Armor for inspiration and noticed it's way better than mine. I changed it to match my style with no outlines and simplified it a bit, but it was still way better than the rest of the armor sets.
So my question is: What should I do to make my armor look more 3d and less flat and boring?

I apologize for white background as I am new and don't know how to do that.