Great Storytelling
I really like the story in this, it's something I wish I could include in my own work. It leaves a lot to the imagination, whilst giving you the fundamentals; something I think all illustration should do.
I think the amount of black surrounding the picture is slightly overwhelming. It seems to shrink the actual illustration in the middle and I think it detracts slightly from the composition.
The level of detail in the foreground is very impressive, but I think the background is missing something. It by no means need to contain as much as the foreground, but I think it currently lacks a bit of depth.
I think this a great piece overall!