The SkullMeta class hasn't been updated for years and now has two flaws:

• Getter and setter for the skull owner still use player name instead of UUID.

• There is no way to access the texture of the skull.

This is the NBT tag of an example player head item (generated using this website):

{display:{Name:"Notch Head"},SkullOwner:{Id:"d220a6b0-d62b-4112-96d6-a1b1846d275a",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvYTExNmU2OWE4NDVlMjI3ZjdjYTFmZGRlOGMzNTdjOGM4MjFlYmQ0YmE2MTkzODJlYTRhMWY4N2Q0YWU5NCJ9fX0="}]}}}

My suggestions:

1) Add a method boolean setOwner(UUID owner)

This method would change the SkullOwner's UUID.

2) Add a method UUID getOwner()

This method would return the SkullOwner's UUID.

3) Add a method boolean setTexture(String texture)

The method would put the texture parameter into the NBT tag's Value field and change the SkullOwner UUID to a new random one.

4) Add a method String getTexture()

This method would return the current texture of the player head.

5) Deprecate boolean setOwner(String owner) and String getOwner()

These changes would make player skulls namechange-proof and would allow modifying a skull's texture without the texture being used as skin by a Minecraft account.

Additionally, the Skull block state class could get methods similar to 3) and 4).