Minecraft 14w31a, Minecraft 14w32a, Minecraft 14w32b, Minecraft 14w32c, Minecraft 14w32d
Steps to reproduce (facing North):
Based on the relative Y coordinate, the painting should be placed 2 blocks above command block, instead it gets placed 1 block above. This same bug also occurs by using an absolute Y coordinate, instead of a relative coordinate.
Using the same command to summon an Item Frame, works properly