This mare looks swaybacked, toed out, ewe necked, and can you say butt high!!!
She is actually spooking in this shot, her front legs are splayed out dropping her withers
And messing up everything great about this horse!
Not that this is a good conformation shot, but you can see the difference a stance can make messing up a horses conformation!
One other thing to consider is the difference in coat conditions and health.
YES, this mare is FAT! She has been out of work due to an injury. Another thing is that she is in the final stages of shedding out and her dead hair in the last photo is making her look dull and unhealthy. Which will be commented on. In the first photo she is sparkly and her coat indicates how healthy she really is.