If this ends up a double post, I apologize. My country-bumpkin server keeps dumping me today.
Pretty girl! And I love your halter. Is that a matching nose & brow band? Really neato.
We use candy and cellophane to bait. Green starlight mints and candy corn are our favs (mine & the horses, gotta have my sugar fix too). I use only cellophane if they start getting mouthy. I don't use anything but my voice and scratches as a reward for teaching new things. The candy is strictly to give ears and neck, and is handed out very judiciously. Even hubby is trained now not to give them treats or even their feed until they give 'pretty ears'.
I had a friend who shows APHA teach me how to pose the ponies. Her method has worked well for us. The off hind is their 'whoa' leg, and they aren't allowed to move it until I cluck at them. That's the hardest step to teach. Once they've got that, the rest is cake. After the 'whoa leg', I teach 'pretty ears' (enforcing the 'whoa' leg). I don't worry about the neck yet. I just want them to give ears without moving the off hind. Then using slight pressure in different directions on the halter/chin chain, I get them to square up the other 3 legs one at a time (our cue is 'step'); near hind, off front, near front. Once they've got that down, I teach them to 'stretch', but I don't like a lot of stretching or parking for mine, just a bit. Once they are steady at that, I start on the neck, sort of enhancing the 'pretty ears'. It sounds complicated, but like Leeana said, they pick up on it very quickly if you are consistant with the cues. I don't drill this over and over. Once they've got it down, a few minutes once or twice a week is all we work on it.
Have fun with that mare; she looks like she'll be just groovy to work with.