Three more great shots, Tom. Thanks for posting them.
Working green wood on a lathe is an art all its own. The key to success is even drying of the wood. So, you need to have evenly thick surfaces. Once you get the bowl (or whatever) shaped, you just wait and see what develops. The evaporation (however uneven it may be) often causes the wood to warp as it dries, resulting in interesting shapes. (There's nothing quite like soaking wet, green wood shavings flying off a lathe.)
This chap you've taken the pictures of is clearly a craftsman.