Minecraft 1.13:

If you want to place a player head using the /setblock command in Minecraft 1.13, it doesnt show the texture of the player correctly. Here's an example command:

/setblock ~ ~1 ~ minecraft:player_head[rotation=0]{Owner:{Name:"LordRazen"}} replace

If you use this command in vanilla Minecraft and activate it, a steve head is shown. If you pick the head with the ctrl + middle mouse key in gamemode 1 you get the head in the inventory, but it's still Steve. If you play this head down again, it's finally the correct player head - but the texture should be shown after setblock or after the picking, too.

Minecraft 1.12:

There's also a similar bug with the player head commands in Minecraft 1.12:

/give @p skull 1 3 {display:

,SkullOwner:{Name:"LordRazen"}}

If you use this command, you get a Steve head named "Dwarf" in your inventory - only if you place it the texture is finally shown.