Cut it out.
I start by using Pen tool, going over it roughly, then use the Polygonal Lasso tool to get into them awkward places.
e.g.

something I cut out before, used the lasso tool for the wings and pen tool for the rest

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iSRO INACTIVE
Current server: Neptune
Level: 72
Character name: Jilbab
Build: Full Str Bow
Weapon: 72+5 Blessed Moon Bow
SWSRO
Current server: Server2
Level: 88
Character name: Jilbab
Build: Full Str Bow
Weapon: 85+5 Bow