Challenge 154 was draw a lemon. This is what my elementary science classes did one day, and what a fellow teacher asked when she saw the set-up. Ink and colored pencil.
And here is my camera for challenge 164, draw your camera. It has a whopping 5 megapixels, which was a lot back when I got it, but now is hardly anything. Still, it serves my purposes. Drawn with a 2B pencil.