Not the best angle for this figure but it shows trhe work you've done on the sheild. I'd suggest that you strengthen the shadow tomnes on the Brass by washing over with a mix of Graveyard Earth and Sciorched Brown washes to get a dual Green Verdigris and Weathering effect . Then strengthen the blue by a series of washes of Blue slightly darker than the highlight. That should pull the sheild's colours together. :D MIke