The first picture, which is far from perfect, shows a foot which is on its way to good concavity, nice thick sole, tight white line. Now an inappropriate diet has put paid to that.
The second photo shows bruising extending across most of the sole, which has lost a lot of concavity. You can also see the extensive flaring of the hoof wall. The third photo below shows just how much concavity there used to be.
This is a super mare, practically perfect. Well trained, well made and pretty. Loves to work and will have a go at almost anything. But everything has a downside right? And hers is her metabolic challenges. If she were human we would probably label her diabetic and treat accordingly. Guess what we do to horses - we nail an iron ring to their feet so we can ignore the problem. But thankfully not (yet anyway) in this case.
I kid myself I am upset for the sake of the horse, which is true, but I am also frustrated at the ignorance of some 'equine professionals' who ruin horse and rider alike.