I like the scorpion in these natural surroundings, and the composition is nice, he is frames around the top and side and seems ready to jump out on the viewer. However, he blends in too well with the background and it makes him hard to see, and lowers the impact. Could you make the yellow brighter? Or desaturate the background? Perhaps a little selective editing after the challenge.
His camouflage colourings mean he doesn't stand out against the drab background, especially because the strong light is creating so many shadows from the rubble and branches. I would also suggest the composition might be better if he were looking into rather than out of the frame.
oh...looking at that bug just gives me chills.....that would be my nightmare! You are a brave soul to photograph that thing....or maybe you are a crazy scorpio!!
I might have tried placing the prop in the left rear of the photo with maybe a tighter crop. Also might have tried darkening him a little. The angle of the sun seems low on the horizon and maybe a little overpowering.
I think this would have benefitted from a tighter crop - or possibly getting nearer and lower. If you crop out the tree on the left I think you will probably see what I mean.