I think they are really nice and I'd be pleased if they were mine.
Horses seem to be difficult to get right, this is a subject I would like to get into more.
I personally think that No.2 would have been a nicer pose if the owner was to look in the same direction as the horse and maybe lean her head against him.
No. 3 would be stunning if the background didn't have the leaves in it and was totally black and cropped a bit more.
No.5 is tender and as Richard says, shows a connection, though I am thinking if his eyes were open slightly it would have been better.??