Ugghhh... I had to comment on this because it's just so alien.
I like how you have included no scale cues in the image: the spider could be a foot wide or just an inch. Nice detail on the spines on its hideous legs.
Technically, the DOF is a bit shallow. It looks like the edge of the brickwork and wood is in perfect focus, but the more distant legs are out of focus. Also, if you ever face this monster again, you could try another picture where it's a bit clearer which end is the head.
I like your composition with the beast either devouring or protecting the 'egg'. All in, this is a good window into another world...
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