Also known as: 首傾げ, 歪头, 首を傾げる, 头部倾斜
When a character tilts their head to one side, which is commonly done as either an inquisitive gesture, or a cute gesture, though it can be done for any reason.
Use common sense when applying this tag: the head tilt has to be noticeable, otherwise every single picture on site could be tagged with it.
Use Head Back if tilted upwards. Use Turning Head if the head is turned instead of tilted.