Nicknacks and gadgets

So far I've only showcased organic pictures, so it's about high time I show off some drawings dealing with objects and random stuff.

As you can see, the last two drawings are imcomplete.
The cup got interrupted by at work and when I sat down to resume the light had changed very much from before.
The robot I stopped drawing because it simply bored me. I'm fairly happy with the shading and texture of the finished arm, but I wasn't happy with the overall design.