Xu Ming's soul seed started changing shape. It kept getting more and more human-like until it started looking exactly like Xu Ming, there was only a small difference between its appearance and Xu Ming's appearance.
The Martial Soul of a person always looked like them. In the Spirit Establishment Realm, the first stage was about forming the Soul Seed. The Second Stage was about making the soul seed become their Martial Soul.
The 3rd to 10th stage focused on improving the Martial Soul so that it could be the best it possibly could.
In the Second Stage of Spirit Establishment Realm, although the Martial Soul looked like the cultivator it belonged to, there were still a few differences left. In the 3rd stage, the differences decrease and the similarities start increasing until the 10th Stage of Spirit Establishment Realm where the Martial Soul looks exactly like the cultivation with no difference.