Wow! I think the expression you have created is perfect! I'm curious though, how do you plan to do the beard? Lechuck's beard seems a little more complicated than the one Guybrush has. Do you plan to do it Telltale style and work in some spots of eerie green? Or just keep it simple and black?
Hmm... just had a thought... you could do it CoMI style and set it on fire! Wouldn't do much good to the rest of it though.