Great metallics Misiek.
This is how Iron Warriors should look. Personally I'm a bigger fan of the original Chaos Raptors, but these do the job nicely. I hope you're planning to paint up some vehicles for your Iron Warriors. A tank would look great painted like this.
Nice crisp painting and the bases look nice but the colours are all so flat. There is not contrast at all. As a result they come off a little bland and don't catch the eye. Punching up to brighter highlights or not dulling down the yellow bits might help this. Otherwise great dirty look to them.