~~~And Paintpony, I just have to say I absolutely love that you always have a wealth of pictures to show exactly what your talking about! I'm always impressed when you post.~~~
Thank you!
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I forgot to say (or maybe I did in another post?) that since you mention you are showing in Open shows with a non-registered horse, "follow" the circuit. If you know of a group that regularly puts on shows that you'll go to, see if that organization gets the same judges rotating through their shows. If you can find out who the judge will be (our show series doesn't post that - used to drive me CRAZY!!), find out what type of judge that judge is (QH, Hunter/dressage, Arab, Morgan, saddle horse, Draft, etc) and then you can train your mare and dress yourself and her to match the style that that judge "caters to" (at least somewhat). Then when that judge is judging the classes you are in, you are presenting your mare the way that judge already likes to work. Of course, do so w/i your mares' conformation (practice different poses and figure out which is just too extreme for setting her up in - then never take her that far.). You'd be surprised how impressed a judge will be and the fact that you might get more "look time" or comparisons to the other horses.
O, and be prepared - some folks will think you are either cheating or "buttering up" the judge. I don't believe you are - I believe you are preparing yourself and your horse to the best of your ability and see nothing wrong with "catering" to a judges specific style of judging. You just don't go to loud extremes.
You could even find out what the judges are taught to look for. Here in NC, we have judges clinics in January/February - every year. A judge that wants to judge Open shows, goes to find out what is required in each different breed standard. They will get to see and judge, (hopefully) a full class of horses of breeds then might not see otherwise UNTIL they get to a show. They might actually be carded in their specific breeds, but once they go to this clinic (can't remember if they have to do it every year or not), they get added to a list that Open Shows, Benefit shows, 4H and FFA shows will then utilize to call judges from. You can sit and learn in the same classes - up in the stands - or at least we used to be able to do so.
ADDED/EDIT - This is a 2 way "street" set up - the 4H/FFA students were also here - this is where they learn the breed standards that they will be placing for their Judging contests. During the 10 years our daughters were active in some form of 4H and FFA, NC DID NOT have standards for either Miniature Horses OR Shetland ponies (actually there were none for any pony breed). ADDED/EDIT
This works even, or maybe especially, in showmanship classes. When we had a specific judge that judged Arabians but was also very much a hunt seat english enthusiast - the youth that presented their horses/ponies in hunt attire w/ appropriate boots/jacket/helmet/gloves and a bridle w/ their horse's mane/forelock braided - got a 2nd look. They did not always place higher BUT they got that 2nd look. Our family attended several shows that would have western, QH type judges - and even the Arabs/Saddlebreds and Morgans would be shown mostly squared up rather than stretched to extremes and in a different halter though not always a "stock type". It was pretty awesome to then see that judge place those breeds over the QH he normally favored - if they moved sound and true (a lot of the QH then didn't here for a few years).
OR you can stick with what you've got and always present your mare as if she is a registered Miniature Horse. Really depends on how you feel about it. You can present even a stocky type horse slightly stretched or a more slender, "stretchy" horse slightly squared up. Just changing the angle/level of your mare's head and muzzle position can make a big difference in what a judge "sees" and appreciates.
I do have some pics showing some different positions of one pony we had...