Very cute mare! I love her face - she has a lovely expression and I can tell by looking at her that she's probably a total lovebug.
She has some minor conformational flaws that may or may not be an issue depending on your discipline - which I gather is western, and so most of what I point out will likely be a non-issue.
First thing I noticed is that she's both downhill and long in the back. While a long back is not ideal for the English disciplines, as it makes it harder for the horse engage and collect, and can sometimes contribute to weak loins, it's not necessarily a bad thing for a pleasure or trail horse to have. A long back usually goes hand in hand with a comfortable, easy-to-sit stride without much bounce. Although I would rather see a horse be level in the back or slightly uphill, a downhill stance is more commonly seen in the western show rings, and quite often in the English rings of stock-breed shows, too. Again, this makes it slightly harder for the horse to engage behind while lifting the front end.
I love your mare's big ears! :) Her neck is nicely set-on, although rather "nesty" - meaning that rather than a distinct angulation between the chest and the neck, they sort of blend in together. There is a slight thickness where her jaw ties into her neck, which may slightly hinder flexibility and make it harder for her to come 'onto the bit.' Her neck is a little long, which means she'll be inclined to be more on the forehand.
She has the QH upright shoulder, which sometimes results in shorter strides and poor jumping, but I've seen several horses with upright shoulders who were both fantastic jumpers and incredibly long-strided. I like the way her front legs are put-together - she appears to be slightly toed-out, but not enough to make any significant difference. It's hard to tell, but she may be very slightly clubby on the left front.
Her hind end is nicely angled, but she is sickle-hocked and undermuscled. She has a nice length to her hip.
The stallion is also sickle-hocked (more so than your mare) and although it's pretty hard to tell, seems fairly long-pasterned. He also looks like he's standing on his toes behind - maybe club feet? It's hard to tell. He's much shorter in the back than your mare, so I'm assuming the baby will have a nice length. The stallion maaaay also be behind at the knee - it's hard to tell with a small pic and four black legs ;)
I hope you don't think I'm ripping your mare to shreds - I think she's super cute, and looks very well taken care of! Good luck with the baby - have you ever been present at a birth before? It's simply amazing!