Here's another cut at it. I'm thinking this is the final unless someone sees anything glaring. As always, comments very much appreciated.

This one uses a terrain for the wall behind the assassin, tiles on the far-building roof, more stars in the sky and I've fiddled with the arrow per EMC's helpful suggestions.

At the risk of drawing attention to it, do the tiles on the back building roof seem too large?

Thanks,
Marc