I agree, I would like some kind of spot color detail to make it stand out more... but I can't find anything. I'm lucky that the model itself (whether you like it or not ) does stand out so much on its own that when the Scorpions are posed amongst other forces... well, it certainly doesn't blend in!
I spoke to the owner, and we might get back to these babies at a later date just to invest another couple hours in the brassworks. O believe some more contrast with the brass trimming will bring out the model much more, and be well worth it, but we'll see.
I plan to take a picture of the whole daemon army of Khorne this Saturday, so I can share!