The Marks of a Shire?
The white irregular shaped blaze on her head, and the white spots in her coat elsewhere.
Look at the lower legs - perhaps covered with long abundant, silky, white feather from knee downwards. Lots of bone. A heavy horse.
At least a hand space, maybe even more between the front legs. A big chested horse.
Flat backed - croup quite high.
A horse meant to pull rather than push.
But there again - you may only have half or quarter of a shire.
Who knows? One can't always believe the paperwork.
Go a google, for The Shire Horse Society.