gotta love the size of the mech, and the comparison to the human counterpart, also the coloring is very well done and the line work is very satisfying, i love the ambiance created with certain colors is very refreshing.
Man blending techniques all up in here, its really nice. The texture and colors are playing really well together, it would be good to see that kinda stuff in future works, even if its just for playfulness. Seeing you paint this sort of stuff is rare, and interesting to see your execution. I think the thumbnail has a bit more life than the rendered, which might be due to the lighting. It would be cool to see it wrap more around the top part of the mech to give it more form. Right now it's flattening out a bit. A highlight or two might do it also. Just some thoughts on it. Other than that, I am totally digging the design, and the boldness of it. Keep em coming man...THUNDER...THUNDER....THUNDER RATS HE HI HOOOOOOOOO!!!!!!!
The design of the robot is awesome, and I love its scale! I also think that the colour you've used for the shadows is really effective! :>
I don't see anything wrong with your directions to be diverse... What are the drawbacks of it? I thought it'd always good to keep your options open, and if you enjoy this kind of subject matter, then you should definitively do so.