Hello Liquidfgc! I'm so glad I caught your interest!
1) Regular sketches come as B&W, either unfilled like this :
or filled like this
Color comes at an additional fee :]
2)I am not extremely familiar with drawing robotics, so I would only accept simple robotic commissions, nothing too complex, at least for my unfamiliarity with it. You can always show me your idea, and I can tell you if I would accept it or not! :] ♥
I hope this helps!
Feel free to ask any more questions ^^