I have here an update on my Sternguard for my Imperial Fists. As I'm trying a few new paints, its taking longer, but I find that painting yellow always takes awhile anyway. So far I'm happy with the armour, just need to tidy up the details and add weathering and battle damage. Unsure at this stage as to do OSL for the eyes. We shall see. I decided to go for the white trims (and pad) as they are 1st company and I do follow the Codex Astartes (mostly) in terms of markings. Plus I think they look cool (always my first rule).
Undecoat white (as opposed to my old blackundercoat, madness I know)
Yriel yellow (2 smooth coats)
recess wash of Agrax Earthshade
Build up the Yriel yellow again
Bad Moon yellow highlight (old citadel paint)
Light glaze of Gryphonne sepia
Touch up with Yriel Yellow
Next will be the details, base and battle damage. Let me know what you think.