You've gotten really good by the way lol.
I think it was just a big piece of luck. I just had an idea, first for helmet, i wanted to use it as an attachment. But then i realisised some older models of someone who created awesome attachments, abd opinions were, that he should create whole model of some unit, so I started. Testing, modeling and combination of good textures together. And also i did that model only as a breake to my main work, currently iam working on something very very special.
For me modeling is something unattainable. I can only admire your work. You do great things ! +5