...Am I the only one who thinks drawing hands is easy? Personally I'd say (human-oid) FEET, but more than that: Faces. When they're directed straight ahead. Because trying to get everything more or less symmetrical while sketching SUCKS (because I use Traditional style and can't just mirror the first half, ugh...).
In general, I struggle with poses and different views. I can do profile for animals, and 3/4 for humans, and that's about it.