OK, now keep in mind that, while I read a lot, I've never shown my own dogs (we use a handler)

But, I'll give it a shot!
The back legs look pretty good, a plumb line from the point of the buttocks should fall just at the tips of the toes, and it looks like this is the case (I'm at work or I'd open up my photo editor and really have fun

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The front legs either need to come under her more, or she's "posting" (leaning backward) and you need get her to lean forward a bit. I'm inclined to say she's posting due to the lead (more on that in a second), and would say a bit of bait in front of her nose (or a toy thrown out in front of her, as they do for show photos) will bring her forward and convey a sense of energy or anticipation. Another trick is to pull backward slightly on her tail, which will cause her to pull *against* you, forward.
The head could be a bit more vertical, IMO, but that may be an optical illusion. The lead is being held back at an angle - see how it creates a line in the neck? Holding it straight up right behind the ears will give a much cleaner look to the head, and won't break up that nice elegant neck.
Also, I can't tell from the pic, but it looks like her non-show-side flew is hanging a bit (or her show-side flew is caught up in her mouth). Just something to be aware of as it does detract from the smooth outline. (It may be the shirt sleeve of the handler, though, in which case nevermind

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Again, I recommend DogRead at yahoogroups, Show Me: A Dog Showing Primer is the book this month and I think it will be invaluable! (And actually, a few of the things I've commented on here were learned from last month's discussion on How To Photograph Dogs).