I love things like this. It is very artistic and has good use of coloring and the background makes it all come together in a scifi way and artistic way. Your background was good but a bit blurred and perspectives seemed off, but I did like your blending. The robots facial and detailed eyes really were good. I loved the added touch of a lightning rod in one eye behind the eye. I would recommend more sharpening of the image and more perspective and depth to the background but good job overall.
~~THINGS TO IMPROVE ON~~
I would just make things a bit sharper.