wow! the water droplets on the metal has an amazing effect that really brings the rest of this piece much closer to reality than we normally see in digital art. i'm not sure if the heavy rain really fits with how those droplets are shaped and such, unless the figure is stepping out of the rain. either way, this is a very memorable piece. as usual, i love the designs and the way you handled the lighting.
Since you want "critique"... The execution is perfect, but have in mind that in Sci-fi, due to its technological nature, requires research about technology and the purpose of its designs and how specialists project its evolution, that way you will build your compositions based on something tangible and every time you need to make a decision about design you'll have the tools to decide the most realistic one. I don't mean your composition is not realistic, but if you put it in context you better have a lot of explanations to give, from climatics to politics, background story is essential to even start drawing.