pixel art is for TV screens and computer monitors. use adobe illustrator/photoshop for posters and other printed media. it'd be great for a once upon a mattress RPG title screen though =P
I kinda agree with that...
If you want it pixelized, I think it needs to scream "pixels!"
Maybe try doing a super low-res 8-bit kinda thing...
This poster currently looks like it came from an old SNES Game, but I'm not really getting a pixel feel from it.
The play's a spin on the old story of "The Princess and the Pea", right? Maybe some mattresses stacked with a tiny green pea at the bottom? I think the play is supposed to be kind of a comedy, too. This looks a little too serious for a comedy.
Have you tried looking at other posters for the play? The all have a pretty similar motif:
http://images.google.com/images?svnum=10&hl=en&lr=&q=once+upon+a+mattress+posterI'm not sure. I've never seen it. It's cool you're using pixels, though. Not sure if it's the best way to go, but interesting.
Also, is the plural for mattress mattresses or mattri?