These look really good! I think you're doing better than you think ^-^
For feedback I would say that you should try to make sure you don't skew your cylinders, most of them look really good but some stand out as a bit awkward.
Those second ones are much nicer, remember that when they're not going straight across or straight down, they're still a uniform cylinder that follows a straight line.
Hopefully this feedback is useful but I understand if it's not ^-^