This is quite interesting so far. Make sure you've got a type of tree species that you're trying to sculpt if you're going realistic, and get lots of detailed ref photos. I feel like tree bark is super complex, so good on you for going after it!
Haven't updated in a while because I have been jumping in between unfinished projects so I might one day finish em all while I got a clear head for this one. I have decided to get a bit more flexible, instead of a very static High poly sculpt -> low poly retopo -> unwrap -> texture; I will now continue on the low poly and…