Helicopter heading would affect where the picture appeared in the windows, but the actual picture itself is invariant under heading. Of course if the heading was such that the picture was behind the window pillar, then it would raise even further questions about the reflexive requests for visual separation and reinforce the notion that the helicopter had a reasonable assumption that a published heliroute would keep it deconflicted from landing traffic.
I'm more familiar with the London Heliroutes (see earlier posts on this thread) where the only time you'd be asked to accept visual separation is from opposite direction helicopter traffic also on the routes. You simply wouldn't get a clearance to start on any route unless all helicopters involved had already accepted visual separation. A helicopter would never need or ask for visual separation from fixed wing traffic, because the routes are designed and operated to achieve procedural separation.