What is impressive about this piece is that you say it took you 8 hours, yet on first glimpse it looks as though it was created in less than an hour. It's amazing to think that something that took you so long looks so simple, yet if there when created and knowing that this might have been created on a larger scale rather than a simple small rendition would explain it. Still, you demonstrate a wonderful understanding of the anatomy and the clean line art and general proportions of the figure is touched upon and executed well.
It might be nice to expand upon this with further detailing the design with shading or a light source. Maybe create your own setting from this figure.