I have seen many different variations of machined creatures, varying from different styles, but this one in particular works perfectly in portraying what I feel would be how a mechanical scorpion would look like. The way the outer body layer curls over the machinery below, stretching out beneath the legs to form the structure is something to be admired.
Perhaps if you added a darker background with various lights surrounding certain areas of the body, it would give the model a sense of depth. Of course this is only a suggestion.
The model looks digitally painted with a wacom, rather that an actual model, which to me is a good thing. I feel it adds to the picture, with that slight etches to the colour.
The model has been constructed very well, so theres nothing more to say other than good job.