yup, i agree with alex...either hand draw/colour it all (after dropping the white shadow around the sg), or come up with a new concept.
this still disappoints me! i want to see more crayon/coloured pencil posters up here.
You should try hand-drawing the whole thing with wax crayons. Don't worry about things looking rough or 'wrong' - I really think it could look amazing. Don't use any images other than those you draw yourself. That way the layout will match the medium.
My thoughts anyway.