I like it, a lot. The spider-woman image is pretty prevalent, which is why I gave you a 2 on originality, but you don't have to be wholly. original to make good art.

I think that the loose strokes and sketchy detail add something to this piece. It gives the monster a nightmare quality, suggests fright, or details too horrible to contemplate. I think you did a really good job of capturing the important forms in a few quick strokes, and your use of color is inpired in places.

The way the figure sort of melts into the dark background at the bottom edge of the painting also goes a long way toward reinforcing that nightmare feeling.

I am a little confused by the way your implemented the light, though. The only visible source of light is the burning weapon. However, the figure's breasts, face, and left arm seem to be lit very strongly from above. Also, the corner of her torso farthest from the fire is the brightest, which seems sort of backwards to me. Finally, there is what appears to be reflected firelight on the creature's spider-abdomen, way in the back.