/ic/ - Artwork/Critique

ive been grinding anatomy a lot lately. pic related is all pretty solid when i overlay the ref and check. but i noticed i usually have minor mistakes like a leg being too short/long by a half a head length or an arm held over the head will be at a slightly different angle, etc. how fucking accurate do i need to be when copying a ref? drawing accurately to the point that its literally a 'trace' seems unrealistic