Very stylish
It looks great. I love the sketchy yet tight style you have going on there. I also like how you use that sketchiness to make the body of the robot(or whatever) more busy than it actually is. It creates fake details witch looks good in here. The piece looks good as concept art but I can imagine that this picture would look a lot cooler if you would add some kind of background if even a vague one. Unfortunately it also looks a little bit too flat. Kind of like a cardboard figure. I suggest you play a bit more with shadows while colouring and rely less on the shadowing of the black lines. Right now it does not give me the feeling that it should be 3-dimensional although I understand that with your cartoony style its a bit harder to accomplish but I have looked at your other works and I can see that you can do it. Hope this helps.