From what I can see, he is trying to ask you carry on with the walk.
He is trying to see if he can lead you into what he wants.
NEVER... let him do that.
Be firm, get him to sit... If he do tries to pull of, give him a tug and
reinforce the sit. Until he remain still.
Don't really need to praise him for everything right he has done. Dogs
will know if they have done right by sensing you.