No easy way here.
Filling, pixel by pixel, using the pencil tool is an option. Let me know how it's going next Christmas.
Shame to wreck a worthy piece.
3) DO NOT SHOUT. We can hear you just fine. Using all capitals is often interpreted as rude, so please don't.
Ah, well. Probably just me then. I find the shouty thing annoying. A lack of FINESSE.