on join:
give player player head with custom nbt "{SkullOwner:{Id:[I;-1211027,5318,141349,-10636],Properties:{textures:[{Value:""eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvZTVlYjBiZDg1YWFkZGYwZDI5ZWQwODJlYWMwM2ZjYWRlNDNkMGVlODAzYjBlODE2MmFkZDI4YTYzNzlmYjU0ZSJ9fX0=""}]}}}" with lore "I dont know"