I got a little bit of motivation yesterday and knocked this sucker out. I like how he doesn't look significantly different from basic Tactical Marines. I decided to put the "hazard stripes" in his helmet crest mainly because there was nowhere else convenient on the model to do so. I went with a dark grey/black cape because I feel like the Iron Warriors would avoid flamboyance at all costs. In Angel Exterminatus, they weren't too happy with the Emperor's Children. Way too fancy.
Here's a shot of all of the models I've finished so far. The little white blob by the grass on the Chaplain is just glue that hasn't dried yet. It'll dry clear. I was just tired and didn't want to wait!