I'm thinking about adding a banner of some sort. Other than that he's pretty much ready for paint.
The sicarians are a fantastic kit with tons of cool bits.
They are extremely spindly though and the very fine brittle legs are a pain to remove from the sprues without them snapping. They're also slightly tricky to assemble with the legs separate from the body and flat joins without connecting pins. Well worth it though.
Added a tabard and purity seals: