Minecraft – How to get nearest players head onto armorstand with summon

Heads face towards you when you place them. If you want to place a head face left, move to the left of the spot you're going to place it in before you place it. This is the same as almost anything else that has an orientation, so I assume you want to turn it around with commands.

To rotate a head with commands, the tag you need to edit is the "Rot" byte. For example, to make a head below you turn west, use this command:

/blockdata ~ ~-1 ~ {Rot:4b}

Here's a full list of what direction each number reperesents:

• 0: south
• 1: south-southwest
• 2: southwest
• 3: west-southwest
• 4: west
• 5: west-northwest
• 6: northwest
• 7: north-northwest
• 8: north
• 9: north-northeast
• 10: northeast
• 11: east-northeast
• 12: east
• 13: east-southeast
• 14: southeast
• 15: south-southeast

This is easily done with a scoreboard objective (or scoreboard tags in 1.9)

First set up the objective:

scoreboard objectives add ASfound dummy

Now, set the score according to whether or not there is an armor stand at x, y, z relative to the player by running these two commands

scoreboard players set @p ASfound 0
execute @e[type=ArmorStand] ~-x ~-y ~-z scoreboard players set @p[r=2] ASfound 1

Now all you have to do is run the tp commands depending on the score:

tp @a[score_ASfound=0] <downward>
tp @a[score_ASfound_min=1]  <forward>

Replace <downward> and <forward> with relative coordinates as needed.