My first homebrew successor chapter.

So I've been brooding over my second Warhammer and first Astartes army, I'm asking for suggestions and critique for the paint job and the lore I had in mind. Aretium Guard. I was thinking and please correct me for inaccuracies of a blood angel successors chapter form 13th founding, fleet based not long before finding a feudal world deep in the ultima segmentum named Etrusco on which they build the fortress named Aretium. The planet was undiscovered probably since the golden age, it exhibited a culture brought upon them by the numerous knight houses and the ancient thrones inside them, that had similarities to renaissance age Italy from old earth, which even though unknowingly influenced the Aretium Guard to take up the arts and crafts similarly to the blood angels. They decorate their pauldrons and take great pride in not getting the paintings damaged, to the point of many Astartes of the chapter using old mk plate from mk3 to mk6.