Great use of technique.
I really would like to see a finished version. The scale is well depicted, and is full of menace. The lighting is wonderfully dramatic, yet naturalistic.
This would make a very nice piece, if you decided to finish it. Very dramatic, and certainly frightening from the perspective of a defender trying to keep that horde out!
Awesome light, contrast and perspective! I hope you finish it. Fighting orcs is one thing. Seeing that bad giant make that entrance is quite another.