I'm not so much into the design... it's a bit too much of everything... maybe you could keep it a bit more simply?
and did you try to use the smoothing tool? it's the last one in the right upper box... I allways use it on 75% or more... it makes your lines less shakily ^^
But I'd love to see another try of you =)
I'm participating in the game Lights On/ Lights Off which is a way to trick or treat in the virtual world. For more information look at this Thread. Happy Halloween to all!!