Mmm, in fact you prolly already compromised the silhoete more than you should. You should remove as much surface poligon detail as possible, and keep the silhouette polys.
Painted as red where you should get rid of those polis, the normal map should sufice for these small details.
Painted as blue where you should add some extra loops, so it keeps the silhouete
[Blocked Image: http://i39.tinypic.com/fmmdzl.jpg]