Iron Within! Iron Without!

Decided to get adventurous, and try some of the techniques suggested by my fellow Imgurians. I was please how it turned out!

Any tips on how to make the hazard stripes straighter, or is it just practice? This was my first time trying it out.

Here's a comparison between my Ultramarines Captain and this Iron Warriors Tactical Marine (Horus Heresy era). I'm definitely learning, and improving, thanks to everyone and their suggestions.