First of all, I'd like to say that they are in good weight and look very well cared for.
However, they have some conformation flaws which I would consider them to not really be of show or breeding quality.
Shylo has a poorly conformed neck that comes out low from her chest, which does not allow it to raise up naturally. You can see when she is asked to stretch her neck, it bulges out of the bottom because she isn't built to raise up her head properly. Her rump is very, very butt high (higher than her withers). Ideally, you'd like to see the withers and the top of the rump to be level to the ground, and in some breeds the withers a teeny bit higher. She is built backwards and this will make it very difficult for her or her offspring to ever be useful for driving or other performance disciplines. Her tail is set somewhat low, which generally is not desirable in miniatures. She also looks like she tends to be sickle hocked in the hind legs a little bit.
Sapphire is slightly more balanced overall than the other two mares, and her hind leg angulation is the best out of the three. However, she is still a little butt high and her neck also comes low out of her chest.
Apple looks like she could be related to Shylo in that she also has a very, very high rump and low neck set. Her neck is very, very short which is undesirable. She looks pretty straight in the shoulder, and this sort of upright shoulder does not lend itself well to good movement. She also has the plainest head out of the three.
I hope this helps you identify some of the conformation issues in your horses.
Andrea