Excelent job on this piece. I believe it is a great piece of work.
The shading and the Coloration of this piece is great. the red adds to the darkness and the texture of the piece. i love how it looks as though it is in a war stricken town. the robotic arm is a great piece and i think you did excelent on it. The mane and tail have great detail to it and it is a overal solid drawing.
The effects that you put into the picture of the wall really add to the effect of the picture, it looks as though you hand drew it from scratch. This is a spot on job.