Quote - stolenanjel,

...If you go back to Poser and place a large box with dimensions a bit larger than your wings close behind your character and then render.  You will then be able to see what the shadow pattern will be that needs to be replicated on your pasted wings.  At this point you could follow Ofthepasts suggestion and use the dodge and burn tool to try and replicate the pattern...

 

Brilliant! That is so simple I can't believe I didn't think of it. Thank you!