Working on props....

Really like that ghoul concept. 7 feet sounds like a good height. Tall enough to be impressive . Could you use black plastic over chicken wire for the inside. and maybe spray it flat black? I wonder if you could put a black screen scrim halfway back in the hood and stencil on a faint skull face with reflective paint. Just enough to pick up some stray light.

Seems a shame to do all that work and have to pray for dry weather. If you hadn't already painted them I would have suggested some bedliner spray. That would have waterproofed them somewhat as well as giving them texture.
They do look nice and the whole setup will look great but I would be bummed if they melted on Halloween.