Another Halloween Design

I'm sort of cheating here as I did this one before the other female vampires design and it features a couple of classic horror characters. However I learnt a lot from doing this one first, mainly around the use of the Pen tool in PS
As per usual I sketched out the idea using a standard hard round brush with a dual brush setting to give it a pencil like texture. The original plan was to do a painted pulp magazine type cover, but then I decided to go for a Roy Lichenstein pop art design. Here's the sketch