great idea for effect, however your poster design needs much more work, sorry to say.
You would benefit greatly from purchasing Paintshop Pro or Photoshop - paint will not and does not give that professional look to work. The ideas you have put together are great and the images will work, providing you clean them up alot more and get the perspective correct and use a better fonts for the title and name - there are hundreds of free fonts that would suit your theme simpel surf my friend.
Hope that didnt come over as harsh - but please take a leaf out of WeirdMagic's book and see why his images stand out, Presentation is everything.
All the best with your effect and designs
I know its kinda bad, i just made that in paint just to give you a general idea on how the coffin will look when its all done being painted and all its details, the grim reaper however looks really acurate on how he looks...