Meh.
Lots wrong with this one. I believe that art is a craft and should have a good amount of time invested into it, not just 40 minutes because now it's rife with flaws.
For example, her right hand has five fingers, one index, one ring finger, one pinky and two middle fingers. That's fucked up. Not to mention that her rib cage is pulling a 180 degree turn and as a result her hips and ass don't connect properly together as they're both in completely different positions, as if you drew both half's at different perspectives, spliced them together and used her left arm as a method to cover up the inconsistency. Her index finger on her right hand is also drawn at a different angle than the rest of her hand, pretty obvious that it's actually an add on and not a part of the original sketch. In before you use the excuse that's shes a ghost and therefore can bend her body beyond any given physical limitations conceivable to human anatomy.
The outlining is shaky and rife with inconsistency, making the characters proportions jarring and incomplete looking. I think there's an overemphasis on coloring rather than the actual artwork here. It appears as though you're using Fireworks or Photoshop or Illustrator for your artwork, for the sake of cram art I'd recommend using Flash as opposed to the former, it has a much cleaner and less complicated interface than Photoshop.
Once you get down to all the flaws, the piece really ceases to be sexy.