Understanding Values with my first test in photoshop+wacom

Well, hi Everybody, this is my first test using my wacom bamboo. I started this digital painting droping some values and consecuently blocking into the forms, for this robosuit I developed two different surface tones. I will continue setting the values and try some reflected light, I will keep it Matte, no specular reflection for the moment (maybe for the headset vault)

Trying to get correct perspective a little bit more, maybe still too dramatic