Its not bad.
Its nothing amazing but its able to get by. The buildings need to be either removed from the picture or they will need a lot more detail if you want to keep them in the picture. It lacks shading but I kind of like it that way. Makes it sort of stand out. However the shadow of the robot, while maintaining the basic shape of the body, looks a little too clumpy and starts looking more like a shadow of weepinbell from pokemon! I also disliked how the cape thing has rips in it, while its shadow looks nothing like that. I know it must have been hard drawing that, but you can't get lazy and make the shadow note the same shape. Now there are somethings I like about it, like the colors on the robot and its shape and physique. Now even though it looks kind of silly with a mouth, I really like how the head is, with things protruding from the head, making it look more mecha than just "a robot". I really like how the limbs look like they are all seperate pieces that fit all together. I know already mentioned how I like the colors, but I really do like them! Its able to keep it simple with the variety while at the same time making it stick out on its own. When ever I look at that planet in the top left, I suddenly think of Unicron from Transformers! ( I know that was off topic, but it really does!) One last thing I want to mention is that as soon as I saw the cape thing, I immediatley thought of Trigun, which is something that you seem to take a fancy to. Well I hope this was helpful and if not, then why did I even bother typing this long?! Good luck with your artistic skills and have a good day.