Sure and thank you she is mine. I think I was lucky on the head shaking, she shook her head and I said "disagree" and gave her a treat and she connected it right away. You could get your horse to shake his/her head by maybe tickling their ear maybe even us a feather touch the inner ear I think they would shake and having a cue word and treat they should be able to connect it. Whatever works haha.
For the hoof shake I just pick up her feet and say shake. Move on to tapping and she lifts leg on her own, afterward she got the idea when I say shake to give me her leg. But as you can see, she is very spoiled and makes me do most of the work getting it.
For smile, if you have something that smells odd like and onion or cologne. I think that will trigger the flehmen reaction and you can say "smile" and give a treat. You don't have to use treats if you don't want to. "good girl" or a pat will suffice but I find she picks up things super quick if treats involved.
Hope I explained it well.