The Half Moon Eye is a look of anxiety. It is often used by a dog to avert their gaze to a trusted adult, or to look away from unwanted attention or affection. The eyes seem to say "Oh no, Here it comes."
The Head Turn can be seen when dogs have "had enough." The head can be turned away from, or be exaggerated toward, the source of their anxiety.
In the first three pictures above you can see the Ears pinned back or forward on the head, but not moving freely.
The last dog is saying " Talk to the paw." The Lift or Wave of the Paw can often be seen when dogs want you to go away.
The Lip Lick or Tongue Flick are usually subtle because they happen so quickly. Dogs do this to say "I'm nervous." You can often see other body language along with it, like the ears pinned back, or the mouth closed tight.
Yawning dogs are not usually sleepy. More likely, if they are yawning when wide awake, they are tired of something or someone that is bothering them.