Aw, thank you for getting to me before I got to you. I caught your list while I was at work and didn't respond right away. Since the other two got asked here are the latter:
19. Favorite inanimate objects to draw (food, nature, etc.)
Hmmm... dishware maybe? They can be as simple or intricate as you want AND have the potential to hold lots of neat things and be held in interesting ways. I'm saying this while mostly considering cups and silverware. I do like a nice cup.
20. Something everyone else finds hard to draw but you enjoy
Fairly flattering portraits of people and animals. It can take me a few passes but it's one of those things that you take all of the imagination out of and just enjoy for the impression and technicality of it. Sometimes that's really fun. I also used to like to draw feet a lot. Not in any special detail but I could do a very good gesture of them. They're something you see all of the time but they have such range and are really weird, charming, and interesting to look at.